Features:Small and exquisite, all models without square control buttons8 buttons with backlight design, which is lighted up at the touch of a button.Easy to install, you needn't to dismantle the steering control.Specification:Item Name: Steering Wheel ControllerFeatures: with Backlight, Easy to Install, Convenient to UseBattery: Button Battery(Included)Material: PlasticTips:User's GuideInstallation Precautions :1.read the instructions carefully before installing2.prohibit the positive power and negative reversed,wrong connection cause damage to the product quality is not within the scope of protection3.please professional electrician to install , incorrect installation , I am not responsible .Installation Notes :1.Removal DVD navigation2.the correct connection cable , DVD navigation steering control line ( KEY 1 and KEY2)3.the receiver cable connection methods:While I I KEY steering wheel control line White 2 1 KEY steering wheel control lineRed ACC cable car keysShort black negative ground connectionLong black signal receiving antenna (not connected )4.into the DVD navigation system , steering wheel control interface5.hold the button , then click on the screen function key learning settingsPackage Included :1 x Steering Wheel RemoteControl