Easy to install, it can be easily transferred between different vehicles. It plugs into any 7-pin connector and connects wirelessly with your smartphone via Bluetooth, making operation simple and easy. This Bluetooth brake control is easily transferred between vehicles. Both the output and sensitivity can be adjusted for smooth and firm stops. Provides a smooth and safe braking experience. Bluetooth connection: Make sure the Bluetooth brake control is installed and activated. Select the Bluetooth brake control on your mobile device. Once the connection is complete, you can return to the home page. Advanced responsiveness: The Echo brake controller is equipped with a three-axis accelerometer to provide smooth, responsive braking. It works even if your smartphone is locked, during a call, or the Bluetooth connection is interrupted. Name:Trailer Brake Controller Note: If the connection fails, please power off and restart the Bluetooth brake control. When trying to connect with your mobile device, if the connection fails multiple times, please copy the code of the failure result and contact us through the customer service of your mobile device Colour:Black Material:plastic Package Contents: 1 x Trailer Brake Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.