Product name: quick charge car charger/bluetooth mp3 player/fm transmitter Function: car charger, bluetooth player How to use the charger function Align the plug and insert the device to be charged Compatible with fast charging How to use the player function 1. Tune Tadiotoablank FM station from 87.5MHz to 108.0MHz. 2. Set the FM transmitter to the same frequency with car FM radio. 3.Connect the product to your smart device via Bluetooth, now it can transmit calls, music, navigation to the system car stereo. Or you can insert a micro SD card/U disk into the product, it will play music automatically. Hardware: ABS FM FM Function: Yes PC Interface Type: Bluetooth Size: 1.1 inch Supply voltage: 12-24(V) Screen Color: Monochrome Screen Power Mode: Cigarette lighter type car MP3 Audio source: car built-in MP3 player Applicable gift occasions: weddings, birthdays, festivals, housewarming, exhibitions