Avionics set, assembled by Siebert in 2017, containing Filser TRT800 Mode S transponder, Airplus KRT2-S VHF airband transceiver (8.33 kHz channel spacing), Garmin Aera 500 GPS, Winter altimeter and Winter variometer. All built into strong protective box with heavy duty battery. External battery in protective wooden box. Comes with Microphone and antenna, all manuals and chargers. Dimensions 45 x 30 x 16 cm. In perfect condition. Immediately available.