Feature: 1. The button lights blue for approximately 4 seconds. Easy to install and remove. 2. Powered by built in battery, the power consumption is extremely low. The battery can be used for about one to two years. 3. Applicable to most DVD navigation multimedia systems with directional control on the market. ( version or window). 4. The controller is universal, so you don't need to remove thesteering wheel controller to make it work. 5. It can support 10 buttons to work to meet the common operational needs of the car. You can set the function of each button arbitrarily. 6. Super tactile design, occupying a small space, the side buttons will not cause operation errors due to steering steering. 7. The integrated curved design is perfectly compatible with various steering wheels and has no adverse effect on the steering wheel cover. 8. Flexible installation on the steering wheel according to your preference, the controller is easy to use and helps to ensure driving safety. Specification: Specification: Size: 80x30x22mm Material: ABS+PC Built in battery: CR2032 Transmission method: optimized signal + receiver . Package List: 1 x Controller Button 1 x Receiving Box 1 x Cable Note: Note: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.