Easy to install and remove. This controller is universal, you can use it without removing the old steering wheel controller. Can support 8 buttons to meet the common operations of the car. Ultra-touch design, small footprint, side buttons, not cause wrong operation due to turning the steering wheel. Can be flexibly installed on the steering wheel as needed, this controller is easy to use and helps to your driving safety. Name:Wireless Controller Shape: Round Number of buttons: 8 buttons Button functions include: previous song, next song, volume -/volume +, play/pause, answer call, hang up call. Type:Steering wheel button control Type:Automotive audio controller Type:Multifunctional audio controller Type:Multimedia control button Working temperature: -20-85 Installation instructions: 1. Open the navigation settings. 2. Enter the navigation control learning interface. 3. Click the corresponding function in the figure. 4. the button on the knob controller. 5. When finished, click Save. Colour:As Shown Material:plastic Package Contents: 1 x Wireless 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.