Traxxas Bluetooth Radio Set TQI 2.4Ghz 2Ch Transmitter, 5ch Receiver, Module e-revo E-maxx Slash Stampede 6407 xo-1 Genuine Traxxas Replacement Parts Includes 2ch Transmitter (6509X), 5ch Receiver (6518) & Bluetooth Module (6511) Requires 4 x AA's TQi 2.4GHz (2-Channel) Intelligent Radio System Compatible with Android and Apple iOS Devices Will fit all Traxxas RC's only needing 2ch Transmitter