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's cigarette lighter. Tune the car radio to an unused FM frequency (87.5 to 108 MHz) and then tune this FM transmitter to the same frequency. Pair this hands-free 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 simultaneously and have overcharge protection. The device is safer during charging. The FM transmitter with a built-in smart chip automatically divides the voltage according to the device's needs. Bluetooth V5.0 Hands-Free Kit: Bluetooth 5.0 transmission technology, fast connection speed and stable signal. Automatically connect saved pairings when turned on. The function buttons allow you to easily select FM channels and play/pause/answer/record calls. Wide Compatibility: This FM transmitter supports music playback 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 4.7 cm Package Contents: 1 x Bluetooth Car Adapter 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 to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.