For both 4.8V and 6.0V operation. Intended for use with radio systems that do not have servo reversing facilities. If used with a Y lead it will reverse only one of the servos for flaps or airbrakes ....

The Castle Creations Arm Lock Key Harness attaches to the AUX LINE (On Phoenix Edge ESCs) and the receiver, and is designed to act as an extra safety measure while operating your RC Heli or Air....