This Bluetooth Media Button allows you to control music at your fingertips with a single press when your smart -phone / tablet is out of your reach. | It's a media control button that allows you to play or pause music, skip back or forward a song, increase or decrease the volume of your media. | Use the included mount to attach the Media Button to your steering wheel or onto bicycle handlebars, allowing you to keep your eyes on the road and your hands on the wheel. | Convenient to use, small and compact, the wireless Bluetooth range is up to 40 feet. CR2016 battery is projected to last at least 1 year. Come with a strap, you could freely take it anywhere you go. | Compatible with most of iOS devices supporting Bluetooth 3.0 and later (support for iPhone 7 and for iOS10), for Android OS 4.0 or later. iPhone X and above, unable to activate siri

Bluetooth FM transmitter: send the music of mobile phones / U disk / TF card to car audio. | Car charger: charge mobile phone/tablet through the USB interface, max output up to 2.5A. | LCD display FM frequency and voltage, more convenient to use. | Car USB, can read via USB U disk, or via TF card slot. | This device transmit signal by wireless method, no need to modify anything in car. It can be used both as the music player in entertainment purpose or hands-free car jut for the safety driving purpose.