All Castle Creations speed controls feature: Battery Eliminator Circuit (BEC): eliminates receiver battery Safe "Power On" Microprocessor Controlled Tough surface mount construction Audible Arming Signal Auto Motor cut-off with reset Low torque "Soft Start": protects gear boxes and belt drives from shock Smooth reverse exponential throttle Self-calibrating endpoints: maximizes usable stick travel Auto shut-down when signal is lost Simple setup: no complicated switchesor wiring