Transponder with modes A & C(to 30,000ft) in a wooden box. JAA compliant. Tested spring 2006. Aerial on a ground plane that clips on to the burner frame. Size; height 33cm, width 19cm & depth 16cm, weight 6kg inc battery. Open to offers but it cost £600. Photos avbl. (Mike Scholes – 01444-487610, mikescholes306@gmail.com)