It included a noise cancelling function and was powered either by NiCad batteries (with a battery life of 16 hours on radio pilot and 7.5 hours on cruise control sound) or by power from the aircraft.
The device included a noise-reducing function and could be operated using either NiCad batteries (lasting 16 hours on radio mode and 7.5 hours on cruise control mode) or being powered directly from the plane's electrical system.