1. FM transmitter supports 87.5-108.0 MHz full frequency range transmission. Compatible with mobile phone navigation and voice prompts. 2. Bluetooth 5.0 technology enables hands-free calling, including answering, ending, rejecting, and redialing calls. 3. Supports Bluetooth stereo music playback. Compatible with MP3, WMA, WAV, FLAC, and APE audio formats. Supports playback from U disk and memory card (not included). 4. Digital display screen provides clear and intuitive information with simple operation. Features colorful ambient lighting for enhanced visual appeal. 5. Supports car battery voltage detection to monitor battery status. Includes automatic power-off and memory function for reliable performance. 6. Dual USB ports provide 5V/1A and 5V/3.1A output for fast charging. Supports charging device recognition.