Avionics unit, with Filser ATR500 airband transceiver, 25 kHz channel spacing, and Garmin GTX 320A transponder Mode C with altitude encoder. Comes in blue padded bag, with lead gel battery charger, speaker microphone, 2.5m low loss high frequency transponder antenna extension cable (BNC-BNC). In working condition. Transponder antenna and UHF basket antenna optionally available.