Please notes: 1.This product only supports Bluetooth-compatilble connection for mobile phones and tablets. Other devices with Bluetooth function are do not support, such as car Bluetooth-compatible, MP3 players, e-book , etc., are not currently supported 2. Does not support for phones, Bluetooth incompatible Note: 1. Professional Installation Is Highly Recommended! 2. High speed stepper motor with a quick response ! 3. The light of the actual gauge may be slightly different from that shown on the photo,Hope you could understand! Is Batteries Included: No Hign-concerned Chemical: None Special Features: Remote Controls Item Weight: 0.09kg Item Height: 1cm Item Width: 1cm Item Length: 6cm Model Name: Car Radio Control Button Item Type: REMOTE CONTROLS Color: Black Material: Plastic Package Contents: 1 * Remote Control 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.