Easy installation and removal. Applicable to most of the market with direction control function of DVD navigation. This controller is universal, you 't need to remove the original steering wheel control to work. Can support 5 buttons and 10 buttons two choices, to meet the common operations of the car.Super Contact design,small space occupation,side button,will not cause the wrong operation by steering the wheel. Integrated arc design, perfect compatible with a of car steering wheel, does not affect the steering wheel cover.Being flexibly installed along the steering wheel as you like, this controller is easy use and helpful to keep safety for your driving. Steering Controller Power: Chargeable: The steering controller can be by the USB charging cable Universal Wireless Car Steering Wheel Button Remote Control For Stereo DVD GPS With Night Light Material: ABS+PC Color:black Shape: Round Quantity Of Button: 2x5 Buttons Steering Wheel Control Size: 10.3x4.5x3.4 cm Button Function Include: Prev Song, Song, -/+, Up, Hang Up, Stop, Navigation, Mute/Play, Play/Pause. Controller Receiver Power Supply: 12V DC Operating Temp.: -20~85 Installation Instructions: 1.Please find the steering wheel key control plug and ground wire of the DVD player. 2.Then checking the note of each color wire for the remote receiver A.Red Wire as accessory/switch B.GND wire as black ground C.KEY1(Dark Gray) KEY2(Gray) Find theoriginal steering wheel control plug of the vehicle, and connect it to steering wheel control wire block.If the DVD player only have one pcs of the steering wheel control wire, Please connect the Gray&Gray wire to this line. 3.When the wires are connected go to DVD player steering wheel setup ,press the keys onsteering wheel fot three seconds, select the corresponding functions on the screen. Then will be OK. Package Contents: 2 x Controller Key 2 x Stickers 1 x Receiver Box 1 x USB Charger Cable ( For The Steering Controller Power Charging) 1 x English Manual Only the above package content, other products are not included. Note: Light 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.