High-quality FM Transmitter- Bluetooth FM Radio Transmitter Built-in high-performance microphone with A2DP function and voice reminder. Can play and transmit the music from USB Disk to car stereo via FM radio signal. Dual USB High-speed Charging- Using QC3.0 port to can rapidly charge for devices and up to 4 times faster than conventional charging methods and 38% more efficiency than quick QC2.0, can be used to charge for your tablet. The 1A port can provide the fastest possible charge for non-quick charge devices, can be used for to charge for your phone. Bluetooth hands-free calls- When calling coming, automatic pause music, start a hands-free calling through the car stereo after connected Bluetooth. One button click to answer/hang off/reject/redial calls when driving. Music Player- Insert the U disk (up to 32GB) which contains music files into the right " MUSIC USB port", or play music on the Playlist of Phone by connect the bluetooth FM adaptor. LED Voltage Display and Voice PromptDetect and display the voltage of car battery when power is on. Voice prompt tells you whether connected successfully or not. This device is a Bluetooth MP3 Player developed for car-used, which equipped with professional high-performance Bluetooth module and MP3 decoder chip. It can play and transmit the music from USB Disk to car stereo via FM radio signal. It can transmit your mobile phone's music to car stereo via Bluetooth. It can also be used as a hands-free car kit during driving. This device transmit signal by wireless method, no need to modify anything in car. It can be used both as the music player in entertainment purpose or hands-free car kit in safety purpose for driving. Features: Support QC3.0/QC2.0/PE+1.1/PE+2.0/FCP Fast Charge Support an external USB Disk (Max up to 32G), play music in MP3/WMA/WWAV/APE/FLAC format. Support FM Frequency of 87.5-108.0MHz. Support Intelligent Voice Prompt, Incoming Call Number Functions, etc. Support mobile's A2DP function. Music will be played directly while the mobile phone is connected. Bluetooth Version 4.2, more stable signal and better data transmission speed. Built-in Microphone that supports hands-free calling, safe and convenient for driving. Noise and wind suppressed by CVC technology to create full duplex sound quality. Mobile phone will be connected automatically when the device turns on. Fits in all kinds of vehicles with 12V-24V power supply. Specifications: USB Disk: 32G USB Port: Dual USB USB Output: 5V/1A, QC3.0 (5V/3A max, 9V/2A, 12V/1.5A) Bluetooth Version: V4.2 + EDR Screen: 1.1" LED Size: 2.8 * 3.5 * 7.6 cm / 1.1 * 1.4 * 3.0 " FM Frequency: 87.5MHz-108.0MHz Music Format: MP3/WMA/WWAV/APE/FLAC Effective Range: 10M SNR: 85dB(FM:65dB) Degree of distortion: