2 USB Ports: QC3.0 5V/1A - Bluetooth FM Transmitter equipped with 2 USB ports (5V/2.4A 1A),you can charge two devices simultaneously and has overcharge protection.Smart QC 3.0 USB charges compatible devices up to 4 times the speed of a conventional car charger. Car Battery Voltage Detection and 7 Colorful LED Lights - When the FM transmitter is plugged into the cigarette lighter,the car voltage will be displayed.Criacr FM Car Bluetooth Transmitter has 7 colors LED backlit lights.Bring a cheerful atmosphere to your car.You can change the colors as you like and visually get a stunning color display. 7 Colored LED Lights - FM transmitter bluetooth car features 7 color led backlit lights.Bring a cheerful atmosphere to your car.You can change the colors as you like and visually get a stunning color display. Hands Free Excellent Stable Bluetooth V5.0- Built-in mic frees your hand to call.You can answer,hang up,reject a call or redial the last number easily.With the latest built-in Bluetooth V5.0 chip,this car bluetooth fm transmitter has stronger Bluetooth signal and faster data transmission speed,which will make your connection faster and more stable. 3 Play Modes - This upgraded bluetooth car adapter can play music via bluetooth,TF card and USB disk.It can bring you amazing hearing experience with clear sound and stereo sound.Car Bluetooth FM transmitter is suitable for all devices with Bluetooth.