Ambient light and LED display: When the power is turned on, the ambient light turns blue, making it easier to use in darker places in the car, creating a cheerful atmosphere. On the LED display, you can easily and conveniently display volume, car voltage and FM frequency. Dual USB Ports and Safe Charging: Supports charging 2 devices with overcharge protection at the same time. One USB port (5 V/1 A) with music notation can read USB memory sticks, while a second USB charging port (5 V/2.4 A) can efficiently charge your smart devices. Enjoy stereo streaming in the car while charging your smartphone. Hands-free calling: With this wireless device, you can easily answer/reject/redial calls and drive safely. CVC technology reduces noise and wind noise, ensuring full-duplex sound quality. Easy Setup: Plug this wireless car kit into the cigarette lighter socket, tune the FM car radio to a null station (87.5-108.0 MHz) and set the FM transmitter to the same station. Pair with your phone via Bluetooth 4.2 and enjoy your music.