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