Universal Wirelesswheel Remote Control for Android Universal Car Stereo Connection: Red wire connects to ACC wire.Black wire connects to GND wire. White wire connects to Android car stereo key wire. Package Contents: Controller Key*1 Receiver Box*1

All buttons can be customized to learn. Effective communication range is up to 5 meters; It will enter standby mode when there is no activity for 1 minute, and quickly power back up once press any key. Only works on JOYING Head Unit. Multikey use CR2032 button battery, Power-saving and extremely lowpower consumption.(Note: does not come with batteries, batteries need to buy their own.). This SWC4 can't fit the head uni with Canbus decoder.