Tactic TTX404 2.4Ghz 4CH TX RX System FEATURES: FHSS (Frequency Hopping Spread Spectrum) eliminates frequency pins and signal interference-pushbutton transmitter/receiver INCLUDES: Tactic TTX404 2.4GHz 4-Channel Transmitter on Mode 2 TR624 6-Channel Receiver, TACL0624 On/off switch harness REQUIRES: AA Batteries: Eight, 4 for transmitter and 4 for receiver Servos of modeler's choice