According to the UK's Paraset Club, the set is known as the Whaddon Mark VII and was used for clandestine radio communication primarily in Norway and Europe, developed at the Royal Signals Special Communications Unit workshops at Little Horwood and the workshops of Whaddon Hall, Buckinghamshire in the early stages of World War II. The equipment is known as the “Paraset” because it was dropped by parachute for field agents.
- Receiver coverage: 3.0 to 7.6 MHz, one band.
- Transmitter coverage: slightly more than 3.0 to 7.6 MHz, two bands, selectable.
- Power output: 4 to 5 watts.