This is the 2.4GHz Micro 4 Channel Receiver from Traxxas.
1st generation, not compatible with the Traxxas TQi 4-Channel Radio.
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″)