This is the HPI 2.4GHz RF-40 3-Channel Receiver. FEATURES: For use with the HPI TF-40 transmitter Fail safe applies brakes to protect car in the event of radio glitches, interference, or if vehicle goes out of range INCLUDES: HPI 2.4GHz RF-40 3-Channel Receiver with Instruction Sheet SPECS: Frequency: 2.4GHz Size: 1.2 x 0.92 x 0.51" (31.5 x 23.5 x 13mm) Weight: 0.25oz (7.2g) jxs 06/29/12 ir/jxs