Wearables may be for general use, in which case they are just a particularly small example of mobile computing. Alternatively they may be for specialized purposes such as fitness trackers. They may incorporate special sensors such as accelerometers, thermometer and heart rate monitors, or novel user interfaces such as Google Glass, an optical head-mounted display controlled by gestures. It may be that specialized wearables will evolve into general all-in-one devices, as happened with the convergence of PDAs and mobile phones into smartphones.
Wearables are typically worn on the wrist (e.g. fitness trackers), hung from the neck (like a necklace), strapped to the arm or leg (smartphones when exercising), or on the head (as glasses or a helmet), though some have been located elsewhere (e.g. on a finger or in a shoe). Devices carried in a pocket or bag – such as smartphones and before them pocket calculators and PDAs, may or may not be regarded as 'worn'.
Wearable computers have various technical issues common to other mobile computing, such as batteries, heat dissipation, software architectures, wireless and personal area networks, and data management. Many wearable computers are active all the time, e.g. processing or recording data continuously.
Wearable computers are not only limited to the computers such as fitness trackers, that are worn on wrists, they also includes wearables such as Heart pacemakers and other prosthetic. It is used most often in research that focuses on behavioral modeling, health monitoring systems, IT and media development, where the person wearing the computer actually moves or is otherwise engaged with his or her surroundings. Wearable computers have been used for the following:
- general-purpose computing (e.g. smartphones and smartwatches)
- sensory integration, e.g. to help people see better or understand the world better (whether in task-specific applications like camera-based welding helmets or for everyday use like Google Glass
- behavioral modeling
- health care monitoring systems
- service management
- electronic textiles and fashion design, e.g. Microsoft's 2011 prototype "The Printing Dress".
Wearable computing is the subject of active research, especially the form-factor and location on the body, with areas of study including user interface design, augmented reality, and pattern recognition. The use of wearables for specific applications, for compensating disabilities or supporting elderly people steadily increases.
Due to the varied definitions of "wearable" and "computer", the first wearable computer could be as early as the first abacus on a necklace, a 16th-century abacus ring, a wristwatch and 'finger-watch' owned by Queen Elizabeth I of England, or the covert timing devices hidden in shoes to cheat at roulette by Thorp and Shannon in the 1960s and 1970s.
However, a computer is not merely a time-keeping or calculating device, but rather a user-programmable item for complex algorithms, interfacing, and data management. By this definition, the wearable computer was invented by Steve Mann, in the late 1970s:
Steve Mann, a professor at the University of Toronto, was hailed as the father of the wearable computer and the ISSCC's first virtual panelist, by moderator Woodward Yang of Harvard University (Cambridge Mass.).— IEEE ISSCC 8 Feb. 2000
The development of wearable items has taken several steps of miniaturization from discrete electronics over hybrid designs to fully integrated designs, where just one processor chip, a battery and some interface conditioning items make the whole unit.
Queen Elizabeth I of England received a watch from Robert Dudley in 1571, as a New Year present; it may have been worn on the forearm rather than the wrist. She also possessed a 'finger-watch' set in a ring, with an alarm that prodded her finger. 
In 1961, mathematicians Edward O. Thorp and Claude Shannon built some computerized timing devices to help them win at a game of roulette. One such timer was concealed in a shoe and another in a pack of cigarettes. Various versions of this apparatus were built in the 1960s and 1970s. Detailed pictures of a shoe-based timing device can be viewed at www.eyetap.org.
Thorp refers to himself as the inventor of the first "wearable computer" In other variations, the system was a concealed cigarette-pack sized analog computer designed to predict the motion of roulette wheels. A data-taker would use microswitches hidden in his shoes to indicate the speed of the roulette wheel, and the computer would indicate an octant of the roulette wheel to bet on by sending musical tones via radio to a miniature speaker hidden in a collaborator's ear canal. The system was successfully tested in Las Vegas in June 1961, but hardware issues with the speaker wires prevented it from being used beyond test runs. This was not a wearable computer, because it could not be re-purposed during use; rather it was an example of task-specific hardware. This work was kept secret until it was first mentioned in Thorp's book Beat the Dealer (revised ed.) in 1966 and later published in detail in 1969.
Pocket calculators became mass-market devices from 1970, starting in Japan. Programmable calculators followed in the late 1970s, being somewhat more general-purpose computers. The HP-01 algebraic calculator watch by Hewlett-Packard was released in 1977.
The 1980s saw the rise of more general-purpose wearable computers. In 1981, Steve Mann designed and built a backpack-mounted 6502-based wearable multimedia computer with text, graphics, and multimedia capability, as well as video capability (cameras and other photographic systems). Mann went on to be an early and active researcher in the wearables field, especially known for his 1994 creation of the Wearable Wireless Webcam, the first example of Lifelogging.
In 1989, Reflection Technology marketed the Private Eye head-mounted display, which scans a vertical array of LEDs across the visual field using a vibrating mirror. This display gave rise to several hobbyist and research wearables, including Gerald "Chip" Maguire's IBM / Columbia University Student Electronic Notebook, Doug Platt's Hip-PC, and Carnegie Mellon University's VuMan 1 in 1991.
The Student Electronic Notebook consisted of the Private Eye, Toshiba diskless AIX notebook computers (prototypes), a stylus based input system and a virtual keyboard. It used direct-sequence spread spectrum radio links to provide all the usual TCP/IP based services, including NFS mounted file systems and X11, which all ran in the Andrew Project environment.
The Hip-PC included an Agenda palmtop used as a chording keyboard attached to the belt and a 1.44 megabyte floppy drive. Later versions incorporated additional equipment from Park Engineering. The system debuted at "The Lap and Palmtop Expo" on 16 April 1991.
VuMan 1 was developed as part of a Summer-term course at Carnegie Mellon's Engineering Design Research Center, and was intended for viewing house blueprints. Input was through a three-button unit worn on the belt, and output was through Reflection Tech's Private Eye. The CPU was an 8 MHz 80188 processor with 0.5 MB ROM.
In 1993, the Private Eye was used in Thad Starner's wearable, based on Doug Platt's system and built from a kit from Park Enterprises, a Private Eye display on loan from Devon Sean McCullough, and the Twiddler chording keyboard made by Handykey. Many iterations later this system became the MIT "Tin Lizzy" wearable computer design, and Starner went on to become one of the founders of MIT's wearable computing project. 1993 also saw Columbia University's augmented-reality system known as KARMA (Knowledge-based Augmented Reality for Maintenance Assistance). Users would wear a Private Eye display over one eye, giving an overlay effect when the real world was viewed with both eyes open. KARMA would overlay wireframe schematics and maintenance instructions on top of whatever was being repaired. For example, graphical wireframes on top of a laser printer would explain how to change the paper tray. The system used sensors attached to objects in the physical world to determine their locations, and the entire system ran tethered from a desktop computer.
In 1994, Edgar Matias and Mike Ruicci of the University of Toronto, debuted a "wrist computer." Their system presented an alternative approach to the emerging head-up display plus chord keyboard wearable. The system was built from a modified HP 95LX palmtop computer and a Half-QWERTY one-handed keyboard. With the keyboard and display modules strapped to the operator's forearms, text could be entered by bringing the wrists together and typing. The same technology was used by IBM researchers to create the half-keyboard "belt computer. Also in 1994, Mik Lamming and Mike Flynn at Xerox EuroPARC demonstrated the Forget-Me-Not, a wearable device that would record interactions with people and devices and store this information in a database for later query. It interacted via wireless transmitters in rooms and with equipment in the area to remember who was there, who was being talked to on the telephone, and what objects were in the room, allowing queries like "Who came by my office while I was on the phone to Mark?". As with the Toronto system, Forget-Me-Not was not based on a head-mounted display.
Also in 1994, DARPA started the Smart Modules Program to develop a modular, humionic approach to wearable and carryable computers, with the goal of producing a variety of products including computers, radios, navigation systems and human-computer interfaces that have both military and commercial use. In July 1996, DARPA went on to host the "Wearables in 2005" workshop, bringing together industrial, university, and military visionaries to work on the common theme of delivering computing to the individual. A follow-up conference was hosted by Boeing in August 1996, where plans were finalized to create a new academic conference on wearable computing. In October 1997, Carnegie Mellon University, MIT, and Georgia Tech co-hosted the IEEE International Symposium on Wearables Computers (ISWC) in Cambridge, Massachusetts. The symposium was a full academic conference with published proceedings and papers ranging from sensors and new hardware to new applications for wearable computers, with 382 people registered for the event.
Dr. Bruce H Thomas and Dr. Wayne Piekarski developed the Tinmith wearable computer system to support augmented reality. This work was first published internationally in 2000 at the ISWC conference. The work was carried out at the Wearable Computer Lab in the University of South Australia.
In 2002, as part of Kevin Warwick's Project Cyborg, Warwick's wife, Irena, wore a necklace which was electronically linked to Warwick's nervous system via an implanted electrode array. The color of the necklace changed between red and blue dependent on the signals on Warwick's nervous system.
Also in 2002, Xybernaut released a wearable computer called the Xybernaut Poma Wearable PC, Poma for short. Poma stood for Personal Media Appliance. The project failed for a few reasons though the top reasons are that the equipment was expensive and clunky. The user would wear a head mounted optical piece, a CPU that could be clipped onto clothing, and a mini keyboard that was attached to the user's arm.
GoPro released their first product, the GoPro HERO 35mm, which began a successful franchise of wearable cameras. The cameras can be worn atop the head or around the wrist and are shock and waterproof. GoPro cameras are used by many athletes and extreme sports enthusiasts, a trend that became very apparent during the early 2010s.
In the late 2000s, various Chinese companies began producing mobile phones in the form of wristwatches, the descendants of which as of 2013 include the i5 and i6, which are GSM phones with 1.8 inch displays, and the ZGPAX s5 Android wristwatch phone.
Standardization with IEEE, IETF, and several industry groups (e.g. Bluetooth) lead to more various interfacing under the WPAN (wireless personal area network). It also led the WBAN (Wireless body area network) to offer new classification of designs for interfacing and networking. The 6th-generation iPod Nano, released in September 2010, has a wristband attachment available to convert it into a wearable wristwatch computer.
On April 11, 2012, Pebble launched a Kickstarter campaign to raise $100,000 for their initial smartwatch model. The campaign ended on May 18 with $10,266,844, over 100 times the fundraising target. Pebble has released several smartwatches since, including the Pebble Time and the Pebble Round.
Google Glass launched their optical head-mounted display (OHMD) to a test group of users in 2013, before it became available to the public on May 15, 2014. Google's mission was to produce a mass-market ubiquitous computer that displays information in a smartphone-like hands-free format that can interact with the Internet via natural language voice commands. Google Glass received criticism over privacy and safety concerns. On January 15, 2015, Google announced that it would stop producing the Google Glass prototype but would continue to develop the product. According to Google, Project Glass was ready to "graduate" from Google X, the experimental phase of the project.
Thync, a headset launched in 2014, is a wearable that stimulates the brain with mild electrical pulses, causing the wearer to feel energized or calm based on input into a phone app. The device is attached to the temple and to the back of the neck with an adhesive strip.
Macrotellect launched 2 portable brainwave(EEG) sensing devices, BrainLink Pro and BrainLink Lite in 2014, which allows families and meditation students to enhance the mental fitness and stress relief with 20+ brain fitness enhancement Apps on Apple and Android App Stores.
In January 2015, Intel announced the sub-miniature Intel Curie for wearable applications, based on its Intel Quark platform. As small as a button, it features a 6-axis accelerometer, a DSP sensor hub, a Bluetooth LE unit, and a battery charge controller. It was scheduled to ship in the second half of the year.
The commercialization of general-purpose wearable computers, as led by companies such as Xybernaut, CDI and ViA, Inc. has thus far been met with limited success. Publicly traded Xybernaut tried forging alliances with companies such as IBM and Sony in order to make wearable computing widely available, and managed to get their equipment seen on such shows as The X-Files, but in 2005 their stock was delisted and the company filed for Chapter 11 bankruptcy protection amid financial scandal and federal investigation. Xybernaut emerged from bankruptcy protection in January, 2007. ViA, Inc. filed for bankruptcy in 2001 and subsequently ceased operations.
In 1998, Seiko marketed the Ruputer, a computer in a (fairly large) wristwatch, to mediocre returns. In 2001, IBM developed and publicly displayed two prototypes for a wristwatch computer running Linux. The last message about them dates to 2004, saying the device would cost about $250, but it is still under development. In 2002, Fossil, Inc. announced the Fossil Wrist PDA, which ran the Palm OS. Its release date was set for summer of 2003, but was delayed several times and was finally made available on January 5, 2005. Timex Datalink is another example of a practical wearable computer. Hitachi launched a wearable computer called Poma in 2002. Eurotech offers the ZYPAD, a wrist wearable touch screen computer with GPS, Wi-Fi and Bluetooth connectivity and which can run a number of custom applications. In 2013, a wearable computing device on the wrist to control body temperature was developed at MIT.
Evidence of weak market acceptance was demonstrated when Panasonic Computer Solutions Company's product failed. Panasonic has specialized in mobile computing with their Toughbook line for over 10 years and has extensive market research into the field of portable, wearable computing products. In 2002, Panasonic introduced a wearable brick computer coupled with a handheld or a touchscreen worn on the arm. The "Brick" Computer is the CF-07 Toughbook, dual batteries, screen used same batteries as the base, 800 x 600 resolution, optional GPS and WWAN. Has one M-PCI slot and one PCMCIA slot for expansion. CPU used is a 600 MHz Pentium 3 factory under clocked to 300 MHz so it can stay cool passively as it has no fan. Micro DIM RAM is upgradeable. The screen can be used wirelessly on other computers. The brick would communicate wirelessly to the screen, and concurrently the brick would communicate wirelessly out to the internet or other networks. The wearable brick was quietly pulled from the market in 2005, while the screen evolved to a thin client touchscreen used with a handstrap.
Google has announced that it has been working on a head-mounted display-based wearable "augmented reality" device called Google Glass. An early version of the device was available to the US public from April 2013 until January 2015. Despite ending sales of the device through their Explorer Program, Google has stated that they plan to continue developing the technology.
Greater response to commercialization has been found in creating devices with designated purposes rather than all-purpose. One example is the WSS1000. The WSS1000 is a wearable computer designed to make the work of inventory employees easier and more efficient. The device allows workers to scan the barcode of items and immediately enter the information into the company system. This removed the need for carrying a clipboard, removed error and confusion from hand written notes, and allowed workers the freedom of both hands while working; the system improves accuracy as well as efficiency.
Many technologies for wearable computers derive their ideas from science fiction. There are many examples of ideas from popular movies that have become technologies or are technologies currently being developed.
- 3D user interface
- Devices that display usable, tactile interfaces that can be manipulated in front of the user. Examples include the glove-operated hologram computer featured at the Pre-Crime headquarters in the beginning of Minority Report and the computers used by the gate workers at Zion in The Matrix trilogy.
- Intelligent textiles
- Clothing that can relay and collect information. Examples include Tron and its sequel, and also many sci-fi military films.
- Threat glasses
- Scan others in vicinity and assess threat-to-self level. Examples include Terminator 2, 'Threep' Technology in Lock-In, and Kill switch.
- Computerized contact lenses
- A special contact lenses that is used to confirm one's identity. Used in Mission Impossible 4.
- Combat suit armor
- A wearable exoskeleton that provides protection to its wearer and is typically equipped with powerful weapons and a computer system. Examples include numerous Iron Man suits, along with Samus Aran's Power Suit and Fusion Suit in the Metroid video game series.
- Brain nano-bots to store memories in the cloud
- Used in Total Recall.
- Infrared headsets
- Can help identify suspects and see through walls. Examples include Robocop's special eye system, as well as some more advanced visors that Samus Aran uses in the Metroid Prime trilogy.
- Wrist-worn computers
- Provide various abilities and information, such as data about the wearer, a vicinity map, a flashlight, a communicator, a poison detector or an enemy-tracking device. Examples included are the Pip-Boy 3000 from the Fallout games and Leela's Wrist Device from the Futurama TV sitcom.
On-chest device or smart necklace form-factor of wearable computer was shown in many sci-fi movies, including Prometheus and Iron Man, however such location of the most precious individual's possession comes from history of wearing amulets and charms.
Advancement with wearable technology over years
Technology has advanced with continuous change in wearable computers. Wearable technologies are increasingly used in healthcare. For instance, portable sensors are used as medical devices which helps patients with diabetes to help them keep track of exercise related data.  Lot of people think wearable technology as a new trend. Although, companies have been trying to develop or design wearable technologies since the past few decades. Whereas, it has recently overhauled the spotlight on these new type of technology which are more focused on making people's life efficient and to be able to adapt the new fad over these devices in the market.
Challenges with wearable computers
Wearable technology being very efficient comes with many challenges, like data security, trust issues, and regulatory and ethical issues. After 2010, the wearable technologies have been seen more as a technology focused mostly on fitness.  It has been used with a potential to improve the operations of health and many other professions. With the increasing wearable devices, privacy and security issues can be very important, especially when it comes to health devices. Also, FDA considers the wearable devices as "general wellness products". In U.S, wearable devices are not under any Federal laws, but regulatory law like Protected Health Information (PHI) is the subject to regulation which is handled by the Office for Civil Rights(OCR). The devices with sensors can create security issues as the companies have to be more alert to protect the public data. The issue with cyber security of these devices are the regulations are not that strict in US. Likewise, the National Institute of Standards and Technology (NIST) has a code called NIST Cyber security Framework, but it is not mandatory.
Consequently, not having any specific regulation for the devices, specifically for the medical devices, increases the risk of threats and other vulnerabilities. For instance, few years back Google glass raised a major privacy risks with the wearable computer technology. Congress has investigated on the privacy risks related to consumers using Google glass and how they use the data. The reason it posed a major risk was because exposes people on always being on surveillance which is not just limited to the users of the product but including everyone around them. Wearable technology like google glass breaks into everyone's privacy because it had the power to record anything or anyone at anytime without them being aware. One could be walking on the streets, at the store, or even visiting the doctor and without realizing that their actions are being watched or recorded by an anonymous person with the help of this sort of wearable technology. Nonetheless, all the data captured on the Google glass was then stored on Google's cloud servers which basically means that Google had access to all of our data. It also instigated security rights of women as it gave the power to the stalkers or harassers to take intrusive pictures of women's bodies by wearing the Glass without any fear of getting caught . This is one of the major challenges which comes with all the wearable technologies.
Wearable technologies like these smart glasses can also imply cultural and social issues. Even though, wearable technologies are making our life easier and more enjoyable, but with the adoption of wearable technology, it allows the social conventions to govern human to human communication. Correspondingly, wearable devices like Bluetooth headphones is making people get hang off relying on the technology than the human interaction with the person right next to you. The society thinks of these technologies more of as luxury accessories and the peer pressure of having similar to what the other person has to not feel left out. It raises challenges of social and moral discipline. Wearable devices are seen as objects of discipline and control like it mediates the cultural ideologies. For instance, wearing a smart watches these days can be an act to correspond with standards if you work in a male dominated field and where people are against feminism. Wearable technologies deals with the issues of bio-politics on understanding the fact that wearables dominating the humans and how they act.
Despite the fact of the demand for this technology is increasing, one of the biggest challenges is the price. For example, an apple watch's price ranges from $399 to $1,399 which for a normal consumer is very expensive and can be out of the budget. Apple recently invented a health watch with powerful sensors for a healthy life which can measure your high or low heart rate notifications, irregular rhythms notification, ECG App, and fall detection accelerometer feature which alerts or allows to easily dial any emergency services and if the consumer or specially people over the age of 65 years is unresponsive for about a minute then it will automatically place a call to the user's emergency contacts.
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The wearable computer was introduced to the US Army in 1989, as a small computer that was meant to assist soldiers in battle. Since then, the concept has grown to include the Land Warrior program and proposal for future systems. The most extensive military program in the wearables arena is the US Army's Land Warrior system, which will eventually be merged into the Future Force Warrior system. There are also researches for increasing the reliability of terrestrial navigation.
F-INSAS is an Indian Military Project, designed largely with wearable computing.
- Activity tracker
- Apple Watch
- Artificial neural membrane (Smartskin)
- Augmented reality
- Active tag
- Calculator watch
- Computer-mediated reality
- Futuristic clothing
- Glove One
- Google Glass
- GPS watch
- Head-mounted display
- Head-up display
- Heart rate monitor
- Internet of Things
- Open-source computing hardware
- Identity tag
- Mobile phone
- Mobile interaction
- Optical head-mounted display
- Personal digital assistant
- Pocket computer
- Skully (helmet)
- Staff locators
- Tablet PC
- Virtual retinal display
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- Zieniewicz, Matthew J.; D. C. Johnson; D.C. Wong; J. D Flatt (2002). "The Evolution of Army Wearable Computers". Pervasive Computing. 4. 1 (4): 30–40. doi:10.1109/mprv.2002.1158276.
- Matthew Cox (23 June 2007). "Troops in Iraq give thumbs up to Land Warrior". Army Times.
- Thomas, B.; Demczuk, V.; Piekarski, W.; Hepworth, D.; Gunther, B. (October 1998). A wearable computer system with augmented reality to support terrestrial navigation. Digest of Papers. Second International Symposium on Wearable Computers (Cat. No.98EX215). pp. 168–171. doi:10.1109/ISWC.1998.729549. ISBN 978-0-8186-9074-7.
- Peer-reviewed encyclopedia chapter on Wearable Computing by Steve Mann
- A brief history of wearable computing
- IEEE International Symposium on Wearable Computers (Academic Conference)
- Project Glass and the epic history of wearable computers, Paul Miller, The Verge, 26 June 2012.