Product Introduction: Note:Every button can set as you want according to your requirement. Decode box and connection: The red line connect to ACC charger 12V+ The black line connevct to ground line GND The white line connect to key1 Note: The owner has two square control lines.please connect the decoding white control line to the pick up machine control line. If the navigation is turned off when there is a delay, please connect the red power cable to 12V. Install Instruction: Please ensure if your car dvd player can install the product before you install it. 1.on your car dvd device it need has the function of study or setting steering wheel control. 2.It need to has the steering wheel control wire on you car dvd cable. Searching way: on the car dvd it may has a diagram of the device connector,you can find the steering wheel control wire, on the cable of the device it wil has a label on it, it always write on key1,key2,swc1,swc2,ADI,AD2 ect. A.please find the corresponding wire on your car dvd under the power off, please compare the Decode box and connection,connect the corresponding wires. B:Enter into the page of steering setting and study the corresponding steering wheel control button, you can check the following picture. C.firstly, please click the button on the steering wheel controller and then press the button on the steering setting on the car dvd ,after studying the button successfully, you can loose your hand on the steering wheel controller. D.you can install the steering wheel controller on the place wherever you want.