ETRONIX PULSE EX4SPRO 4CH 2.4GHZ FHSS STICK RADIO SYSTEMFeatures 4 Channel Radio Digital Screen Programming Spread Spectrum 2. 4ghz FHSS Mode 6 Model Memory Digital Steering And Throttle Servo Monitor EPA Servo End Point Adjustment Exp Exponential Steering Curve Adjustment Exp Exponential Throttle Curve Adjustment Servo Reverse ABS Braking Failsafe Function Sound Switch Function Throttle Hold D R Dual Rate Adjustment Channel Mixing Timer Voltage Alarm JST Plug In Battery Box (Requires 4 X AA) Needed To