1、With Bluetooth answer, hang up, reject, redial phone and other functions. 2、Support Bluetooth stereo music playback, support MP3/WMA/WAV format music. 3、Digital tube display, support for car battery voltage detection. 4、Support 5V/4A mobile phone charging, U disk port supports 5V/1A mobile phone charging. 5、Support U disk playback (1G-32G) and TF card music playback (1G-32G). Features: With Bluetooth answer, hang up, reject, redial phone and other functions. Support Bluetooth stereo music playback, support MP3/WMA/WAV format music. Digital tube display, support for car battery voltage detection. Support 5V/ 2.4A mobile phone charging, U disk port supports 5V/1A mobile phone charging. Support U disk playback (1G-32G) and TF card music playback (1G-32G). Support FM full frequency point transmission function 87.5- 108.0MHZ. Automatic power-off memory function. Support mobile phone navigation voice prompts, support charging identification. Specifications: Material: ABS Rated operational voltage: 12-24V Limit working voltage: 8-32V USB1 Output: 5V/1A USB2 Output: 5V/ 2.4A Support music format: MP3/WMA/WAV Support U disk capacity: 1G-32G Support TF card capacity: 1G-32G Operating temperature: ＜70degree Battery voltage accuracy: Error±1V SNR: ＞60dB Degree of distortion: ＜ 0.1% Frequency response: 20Hz-20KHz Left and right channel separation: ＞60dB Bluetooth Version: Version 4.2 Bluetooth sound processing: With A2DP(Advance Audio Distribution Profile) Function Bluetooth transmission distance: ＜10m/ 32.81ft Effective distance of Bluetooth microphone: 0.5-2m/ 1.64- 6.56ft Package list: 1 x Car Charger 1 x Instructions