Introduction: 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 TF card 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: Brand new and high quality. Built-in MP3\/WMA decoder chip can transmit music files from USB flash disk to car stereo system wirelessly. 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. Memory Function: Mobile phone can be connected automatically when the device turns on. Support mobile's A2DP function. Music will be played directly while the mobile phone is connected. Support FM Frequency of 87.5-108.0MHz. Support AUX input and output. Support an external TF Card (Max up to 32G) , play music in MP3\/WMA\/FLAC format. Integrated car charger of output 5V-2.5A, is available for charging handheld devices in car. Specifications: FM Frequency: 87.5-108.0Mhz Music Format: MP3\/WMA USB Output: 5V\/2.5A SNR: >60dB Degree of distortion: <0.1% Frequency Response: 20Hz-15KHz FM Mode: Stereo digital PLL frequency locking Bluetooth sound processing: A2DP(Advance Audio Distribution Profile) supported Transmission range: 10m Rated working voltage: 12-24V Limited working voltage: 9-26V Package Included: 1 x Bluetooth Car Kit FM Transmitter 1 x Audio Cable 1 x English User Manual