Fangrui Product Details Features : 1. Support For Android/wince Car Multimedia Players 2. Mute, Volume And Next/previous Program (music, Video, Radio, ...) 3. Sticker / To Fix On The Car Steering Wheel 4. 1m Line To Connect The Car Multimedia Player Swc Key Line 5. Easy To Install, Enter The Swc Interface Of The Car Multimedia Player After Wiring, Learn Wiring Notes: 1. This Product Is Not A Portable Remote Control And Cannot Be Used With Any Tablet, Home Tv Or Car Headrest, Roof Monitor... . It Just Acts As A Control Button On The Steering Wheel Of The Car. 2. This Product Can Be Used With For Wince Car Radio Or Android Car Radio. If Your Car Radio Has Steering Wheel Controls, Our Products Work, After Learning The Buttons To Control Radio, Music Or Video. 3. If Your Car Radio Does Not Have Steering Wheel Control Function, Please Do Not Buy It, Our Products Cannot Be Used. Usage Steps 1. Open Navigation Settings 2. Enter The Navigation Control Learning Interface 3. Click On The Corresponding Function In The Diagram To Learn.