This is the TRA TQ 4-Channel 2.4GHz Transmitter. Transmitter only, receiver and servos not included. Automatically locates and locks onto an available channel eliminating crystal and channel conflicts Fail-safe circuitry protects against signal loss if transmitter batteries are depleted or if transmitter is switched off Two position switch for channel 3, three-position switch for channel 4 for full compatibility with TRA models equipped with reversing transmissions and T-Lock differentials Additional channels can operate scale functions, rear-steer options and other custom controls in any R/C model Simple analog trim controls, no programming required TRA TQ 4-Channel 2.4GHz Transmitter Transmitter Batteries: 8 AA cells Receiver: TRA 4-channel micro receiver (TRAL2217) Servos of modeler's choice For version with 4-channel micro receiver, order TRAJ2208 jxs 02/15/10 ir/jxs &