This adapter allows the use of an external BEC for servo power without needing to disable your ESCs internal BEC.
Servo and BEC plug into the double wide end, and the single side plugs into the servo RX channel.
Servo gets signal from the RX, and shares a dual ground path
to both RX and external BEC to prevent floating ground issues. Must have for any crawler running over 300 ounce/ inch servos! Holmes Hobbies P/N: SKU466
