Easy installation and removal.Applicable to most of the market with direction control function of DVD navigation.This controller is universal, you don't need to remove the original steering wheel control to make it work.Can support 5 buttons and 10 buttons two choices, to meet the common operations of the carSuper Contact design,small space occupation,side button,will not cause the wrong operation by steering the wheel.Integrated arc design, perfect compatible with a variety of car steering wheel, does not affect the steering wheel coverBeing flexibly installed along the steering wheel as you like, this controller is easy use and helpful to keep safety for your driving.Steering Controller : Chargeable: The steering controller can be charged by the USB charging cableUniversal Wireless Car Steering Wheel Button Remote Control For Stereo DVD GPS With Night LightMaterial: ABS+PCColor:blackShape: RoundQuantity Of Button: 2x5 ButtonsSteering Wheel Control Size: 103x45x34 cmButton Function Include: Prev Song, Song, Vol-/Vol+, Rang Up, Up, Stop, Navigation, Mute/Play, Play/Pause.Controller Receiver Supply: 12V DCOperating Temp.: -20~85Installation Instructions:1Please find the steering wheel key control plug and ground wire of the DVD player.2Then checking the note of each color wire for the remote receiverARed Wire as accessory/switchBGND wire as black groundCKEY1(Dark Gray) KEY2(Gray)Find theoriginal steering wheel control plug of the vehicle, and connect it to steeringwheel control wire blockIf the DVD player only have one pcs of the steering wheel control wire,Please connect the Gray&Gray wire to this line.3When the wires are connected go to DVD player steering wheel setup ,press the keys onsteeringwheel fot three seconds, select the corresponding functions on the screen.Then will be OK.Package Contents:2 x Controller Key2 x Stickers1 x Receiver Box1 x USB Charger Cable ( For The Steering Controller Charging)1 x English ManualOnly 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.