DESCRIPTION: HANDS-FREE CALLS AND VOICE BROADCAST - Radio transmitter bluetooth supports Bluetooth hands-free calls, answer, hang up, reject, call back(last number redial) and other phone functions; Support mainstream map APP navigation voice broadcast and WhatsApp/WeChat others software language play function. PLAY MUSIC - Bluetooth car adapter support 3 different audio inputs: Bluetooth; U Disk TF Card,  Support MP3/WMA/APE/FLAC format files, support power off memory function and support simultaneous bluetooth connection for two devices. Bluetooth FM Radio Adapter Music Player is compatible with all kinds of music software APP. LED DISPLAY AND VOLTAGE DETECTION - This bluetooth car charger with a LED screen, it can display: car voltage, FM frequency, volume, "CALL" word, and more. Car battery voltage function: Show 3 seconds voltage when plug into the cigarette port, so you can examine your car battery condition. 2 USB CHARGING PORTS - Bluetooth FM transmitter supports simultaneous charging of 2 devices, means that the driver and passenger can be charged at the same time. One is QC3.0 USB charging port, the other USB port supports charging . Brand Name: STEVVEX Gadgets Model Number: ST16GG16592OOK GaN: no Max. Output Power: 10W Output Interface: 2 A Ports Type: Car Charger Power Source: Car Lighter Slot Applied Fast Charge Protocols: No Support Input: 12-24V/2.4A Product Name: FM Transmitter Bluetooth Car Charger Function 1: Car charger, 3.4A fast charging, USB charger Function 2: FM transmitter, bluetooth reciever Function 3: Battery Voltage Display, Multi-function Bluetooth Car Charger Support 1: TF card, U disk dapacity up to 32G Support 2: Car MP3 player, audio player, bluetooth audio player Support 3: Bluetooth hands-free calling Supported Audio File Types: MP3, WMA, APE, FLAC, WAV and Other Hi-fi Formats Ports:: 2*USB 2.0; 1*TF card input, up to 32GB max