Universal Wireless Steering Wheel Control Wireless multi-function steering wheel control designed for Android car radio, DVD, GPS and multimedia systems. Compatible with most 2 Din universal head units, enabling control of in-car audio and navigation functions. Supports Android and Wince Car Multimedia Players with Steering Wheel Control Function. Key Controller Functions: GPS, Phone off/on, Mute, Volume + / -, Mode, and Last/Next Program (Music, Video, Radio, Bluetooth, GPS). Allows operation of car radio, DVD and GPS functions directly from the steering wheel. Helps maintain hands on the wheel while adjusting music, volume or navigation settings. Wide Compatibility. Suitable for a range of Android car radios, DVD players, GPS navigation units and multimedia systems. Appropriate for many 2 Din car entertainment systems. Specifications: Power: 1W Voltage: 3-5V SNR: 96dB Transmission Distance: Approximately 5m with Red light on buttons. The button light illuminates for 2-3 seconds when clicking the physical button. Compatibility Notes: Does not work with Tablet PC, Home TV, car headrest, or roof mount monitors. Requires key 1 and key 2 wires on the car radio player. Compatible with Android car radio players or Wince car radio players with key 1 and key 2 wires. Not compatible with car radio players having key 1 wire only. Installation Instructions: Switch off car power before installation. Connect wires according to the wire diagram. Enter the menu interface to configure settings.