Tactic TTX810 8Ch 2.4 GHz SLT TX No Servos Mode 2 Vehicle FEATURES: Uses true frequency hopping Secure Link Technology making it compatible with most Tactic SLT receivers and TX-R (transmitter ready) aircraft INCLUDES: Tactic TTX810 2.4GHz 8-Channel Transmitter with Manual The instruction manual states that a switch harness with charge lead, 4-cell battery REQUIRES: SLT receiver and servos of modeler's choice AA Batteries: Four