1. Compatible with various brands of U disk, adjust the car radio and Bluetooth MP3 frequency to play U disk songs consistently. 2. Bluetooth 5.0, intelligent noise reduction, clearer calls. 3. High-resolution, high-performance stereo, no lag, support for multiple audio format playback. 4. Power-off memory playback function. 5. Built-in intelligent voltage monitoring chip, real-time monitoring of car battery voltage, to avoid problems such as abnormal voltage failure and anchoring. 6. Dual USB ports can be charged at the same time, up to 3.1A, and the phone and tablet can be charged at the same time without affecting the speed. 7. Parameters: Voltage: 5V Transmitting frequency: 87.5-108MHz