10 Keys Wireless Car Steering Wheel Control Button for Car Radio DVD GPS Multimedia Navigation Head Unit Remote Control Button Function : 1. Support Various Android / Wince Car Multimedia Player With Steering wheel Control Function 2. Key controllers Phone off/on, Mute , Volume + - , Mode , and Last/Next program ( Music, video, Radio ... ) 3. Easy installation Specifications: - Material: ABS, PE - Power: 1W - Voltage: 3-5V - SNR: 96dB - Transmission distance: about 5m Package list : 2 x Controller Key 1 x Receiver Box 2 x Strong Sticker 2 x Rubber bracket Attention for pre-order: * The product could not work with any tablet PC , Home TV , or car headrest , roof mount monitor ... * If your car radio player has key 1 wire , no key 2 wire , , Please do not buy , our product could not work with the car radio completely . * The product can work with android car radio player , or wince car radio player with key 1 ,and key 2 wires . Note: Dear buyer, if you choose no battery , you need to buy it in your local country by yourself .