DUDUAUTO Wireless Steering Wheel Controller: BT connection, easy installation Wireless Connection: Easy installation, BT4.0 wireless link, no need to dismantle the car broken line, installation is simple, a ring a buckle a second to finish. Each key can be customized for learning: Each key supports custom learning, can learn up to 26 groups of functions, and can also customize the opening of the APP. Colour:black Material:plastic The learning functions are as follows: music addition and subtraction, previous song, next song. music play, music pause, one-click mute or resume, answer the phone. hang up the phone, return to the desktop, open voice, open navigation, open 360, open custom APP, etc. Short Long Double the key combination: All five keys are supported. Short and long are equivalent to 10 keys combined. Please Note:The BT SWC should be used with the' DUDUAUTO Car radio Multimedia Player! other devices can not support.please don't buy! Package Contents: 1 * Steering Wheel Controls Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.