The button lights white for approximately 4 seconds Powered by built-in battery, the power consumption is extremely low. The controller is universal, suitable for all car Andrews DVD player and suitable for all 2 din car DVD player 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. Super tactile design, occupying a small space, the side buttons not cause operation errors due to steering steering. The integrated curved design is perfectly compatible with various steering wheels and has no adverse effect on the steering wheel cover. Flexible installation on the steering wheel according to your preference, the controller is easy to use and helps to driving safety. Universal square control buttons, regardless of the model, can be installed on basically all kinds of steering wheels. Requirements: ①After-installed Android large-screen navigation; ②With steering wheel learning settings; ③Navigation must have 2 square control lines [CD player, DVD, or central control are not supported!] Note: The buttons are wireless, and the receiver needs to be wired. Installation guide not included, we strongly recommend you professional installation. Do not remove the steering wheel, only the navigation. Installation is not included. Colour:Black Material:ABS Package Contents: 1 x Wireless Steering Wheel Remote Control 1 x Host box 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.