Color Backlight: Bluetooth car radio transmitter with 6 static modes and 1 dynamic RGB mode. You can switch between the following colors by briefly pressing the light switch button. EASY TO USE: Plug the Bluetooth FM transmitter into the car cigarette lighter; set the car radio to an unused FM frequency (ranging from 87.5 to 108 MHz), then tune this FM transmitter to the same frequency. Pair this handsfree kit with your phone/ via Bluetooth. Then you can listen to your favorite songs or make phone calls. USB ports, safe charging: The car Bluetooth adapter has two USB charging ports, which can charge two devices at the same time and have overcharge protection. The device is safer while charging. The FM transmitter with built-in smart chip automatically divides the voltage according to the needs of the device. Bluetooth V5.0 hands-free calling: Bluetooth 5.0 transmission technology, fast connection speed and stable signal. Connect auto-saved pairings at on. Using the function buttons, you can easily select FM channels and play/stop/answer/ up calls. Wide Compatibility: This FM transmitter supports playing music via Bluetooth, TF card and USB hard drive, and automatically detects and plays music in MP3/WMA/FLAC/WAV/APE format. Compatible with most devices on the market. color:Silver black Material:plastic size:12.8 x 6.7 x 4.7cm Package Contents: 1 x Bluetooth adapter car 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.