Tactic TTX600 2.4GHZ 6CH TX RX Radio System FEATURES: 2.4GHz FHSS (Frequency Hopping Spread Spectrum) technology for interference-free control 5th and 6th channels for landing gear and flaps INCLUDES: 2.4GHz Transmitter TR624 6-ch Receiver, TACL0624 On/Off Switch Harness with Charge Lead 4-Cell AA Battery Holder, Neck Strap, Manual REQUIRES: AA Batteries: Eight alkaline, NiCd, or NiMH (4 for transmitter and 4 for receiver)