Features: 1. After the car is started and ignited, it can display the current voltage of the car battery 2. Play the songs in the U disk 3. Through Bluetooth A2DP technology, transmit the audio and high-quality music in the mobile phone to the car stereo 4. It has the function of voice prompts such as voice reporting of incoming calls, and the incoming call number is displayed on the screen 5. Status information can be displayed during normal playback: frequency point, volume, track. 6. FM transmission frequency range: 87.5~108.0MHZ. 7, Bluetooth hands-free function, with DSP echo cancellation, and noise reduction function 8. Dual USB ports can charge various mobile phones, the maximum charging current is 3.1A 9. Wide voltage power supply 12V-24V, can be used by cars and large trucks