Custom Electronics Servo Driver CEL1410-Custom. This is a very handy tool when setting up a new plane or helicopter or repairing one after a crash. Allows a servo to be operated without the transmitter or receiver. Battery (not included) is plugged in to one lead and the servo is plugged into the other allowing full servo operation. Please see the photos for the details on this sale. If you have any questions, please send me a PM.