Description: Function Buttons: A total of 10 buttons. You can set the function of any button according to your preference through the radio steering wheel control system. For example, Previous Track, Next Track, Volume +, Volume -, Mute, Answer Phone, Hang Up, Navigation, voice function keys, mode. High Quality: High temperature resistance, not easy to wear, feel more comfortable, long lasting and will not fade, sweaty palms will not slip in summer. Backlight: Features a push button backlight for easy night driving to control the radio. Remote control support CR2025 battery. 10m Long distance Control: Adopt with EDR signal transmission technology, connection within 10m. Luxurious design, high end atmosphere, fashion decoration for your car. Specification: Material: ABS Silicone Model: DQX-668 Color: Black Buttons: 10 Buttons(Volume up and down, switch songs, mute, navigate, hang up, answer calls, voice function keys, home page) Size Chart: 140x30x15mm/5.51x1.18x0.59inch Package Includes: 2 Piece Car Radio Steering Wheel Controller 1 Piece Signal Receiver 1 Piece Manual Note: Installation and Debug Methods Step 1: Install the Battery (Battery Model: CR2025). Make sure the positive and negative poles are correct. The screws should not be overtightened to ensure that the button can be pressed normally. Step 2: Installation and Fixing: Fix the remote control on the steering wheel. Step 3: Wiring: Connect the red wire to "ACC". The black wire is empty or connected to "GND". Two white cables are connected to the steering wheel control lines of the radio. Step 4: Buttons Settings: Open the radio steering wheel system setting interface. Press and hold the button on the steering wheel, then click any button on the radio screen according to your preferences to set and define the button's function.