Garmin GTX 33DES Mode-S transponder with diversity and ADS-B out. This unit has diversity which means it uses a top and bottom mount antenna and will meet the proposed requirements for Canada and meets the European requirements for ADS-B. Unit also meets the requirements for the FAA ADS-B mandate. P/N 011-00779-21, S/N 84810768. Includes mounting rack and connector. 90 day warranty. Includes FAA form 8130-3. I have 2 units available if you need a dual installation.