describe:1.2 USB Ports & Safe ChargingSupports charging 2 devices at the same time and has overcharge protection. The USB port (5V/1A) with music symbols can read USB storage media, and the other USB charging port (5V/2.4A) can effectively fully charge your smart devices. Enjoy stereo streaming in your car while charging your smartphone.2.3 modes of playing musicThis Bluetooth transmitter car high-fidelity receiver can send 3 types of music sources to your radio - A. Bluetooth connection; B. U disk (32G); C. TF Card (32G), supports MP3/WMA/FLAC/WAV/APE formats.3.Blue Ambient Light Ring LightWhen turned on, the ambient light ring light emits blue light, which makes it easier to use in dark environments in the car and creates a comfortable atmosphere. Volume, car voltage and FM frequency are displayed simply and conveniently on the LED screen.4.Hands-Free CallingBuilt-in microphone with noise and echo cancellation technology (CVC). This Bluetooth car adapter provides multiple functions; it only needs a multi-function button to answer/reject/transfer/redial calls; it automatically switches from music playback state to hands-free mode when there is an incoming call.5.Wide CompatibilityThis FM transmitter car Bluetooth 5.0 is well compatible with iPhone, iPad, Samsung, HTC, Sony, tablets and other Bluetooth devices such as MP3 and MP4 players. It also fits all cars/trucks (12-24V).Specification:Material: ABSWorking voltage: 12-24VUSB interface: 2Transmission frequency: 87.5-108MHZApplicable mobile phones: universalPackage includes:1 x Bluetooth FM transmitter