Easy to install and transfer between different vehicles. Plugs into any 7-pin connector and connects wirelessly to your smartphone via Bluetooth for simple operation. This Bluetooth brake controller allows adjustment of output and sensitivity for smooth and firm braking performance. Provides a smooth and safe towing experience. Bluetooth connection: Ensure the Bluetooth brake control is installed and activated. Select the device on your mobile phone. Once connected, you can return to the app. Advanced responsiveness: Equipped with a three-axis accelerometer for smooth and responsive braking control. Operates even when your smartphone is locked, during a call, or if the Bluetooth connection is temporarily interrupted. Name: Trailer Brake Controller Color: Black Material: Plastic Package Contents: 1 x Trailer Brake Controller Note: Other products are not included. Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm. If the connection fails, turn off and restart the Bluetooth brake control. If connection issues persist, record the error code and contact customer support.