Tactic TR424 SLT 2.4GHz 4Ch Rx Receiver Only FEATURES: Compatible with all Tactic brand 2.4GHz transmitters and other brands of radios with the SLT protocol Extremely small, weighs only 1.7g INCLUDES: Tactic TR424 2.4GHz 6-channel Receiver with Instruction Sheet REQUIRES: Installation and connecting battery and servos