Features: 1. Support Bluetooth hands-free call transmission to the car FM stereo system to play. 2. Automatically switch from music playback state to hands-free mode when receiving a call. 3. Built-in microphone, the call process supports private answering and switching. 4. Support U disk music playback (MAX: 32G). 5. When the power is turned on, the voltage of the car battery is detected and displayed. 6. 206 channels are available with a frequency range of 87.5 - 108.0mhz. 7. Integrated screen design with LED screen display. 8. Support the last number redial function. Specification: Chip version: V4.2 Supporting protocols: A2DP, AVRCP, HFP, HSP Frequency range: 87.5~108.0MHz FM transmission distance: about 3M/9.84ft Voltage input: DC12-24V Current output: USB output current: 2.4A (maximum 3A) Type-c output current: 5V / 3A, 9V / 2A, 12V / 1.5A (PD 18W) Music format: MP3, WMA, WAV U disk (maximum capacity): 32GB Low voltage reminder: flashing reminder below 12V Product size: about 8.7*5*2cm/3.43*1.97*0.79inch Package List: 1 * Car MP3 Player 1 * Instruction Manual