This is the 2.4GHz Micro 4 Channel Receiver from Traxxas. 1st generation, not compatible with the Traxxas TQi 4-Channel Radio. FEATURES: 2.4GHz For use with the Traxxas TQ 2.4GHz 4-ch Spread Spectrum radio INCLUDES: One 2.4GHz 4 Channel Micro Receiver REQUIRES: Installation in vehicle and connecting battery and servos SPECS: Length: 38mm (1.5") Width: 26mm (1") Height: 16mm (0.63") cnh 8/26/09 ir/jxs updt jxs 01/04/12