Bluetooth FM transmitter, car radio adapter, car charger with PD3.0 and QC3.0 charging connector, bass booster Specification: Bluetooth version: V5.0 Frequency range: 87.5-108.0MHz Product Input: 12-24V USB QC3.0 output: (5V/3A, 9V/2A, 12V/1.5A) PD3.0 Type-C Output: (5V/3A, 9V/2A, 12V/1.5A) Common Output 5V/4.8A (Max.) Music Format: MP3, WMA, WAV USB flash drive capacity: 64GB(Max.) How to set up? 1. Tune your car radio to an unused FM frequency. 2. Connect the UNBREAKcable FM Transmitter to your car's cigarette lighter or power port. 3. It will be turned on automatically by LED, displaying vehicle battery voltage, FM frequency, before showing the word "bt". 4. Adjust this transmitter to the same frequency by pressing the CH button, then rotating the multi-function button when the LED shows the FM frequency. 5. Connect your digital device with this FM Transmitter, USB Flash Driver Support Insert the USB flash drive containing Mp3 files into U disk port. It will upload Mp3 files automatically. Noise and wind are suppressed by CVC technology, which provides full duplex sound quality and allows you to enjoy lossless music while driving. Easy FM Sync It's easy to pair this transmitter with your device. Just activate your device's Bluetooth function and then connect to "UBCH174". Automatically connects to the last paired device and provides a stable connection for hassle-free hands-free connection. Universal Compatibility The UNBREAKcable Bluetooth FM Transmitter can be connected as a hands-free kit with all Bluetooth-enabled devices such as iPhone, iPad, LG, Samsung , tablet, HTC, Sony and other Android smartphones; fits perfectly for all cars and trucks (12-24V). Car voltage display Designed with LED display, it recognizes and temporarily displays the car's battery/voltage for 3 seconds when turned on. Allows you to easily monitor car battery status before switching to autoplay.