Features: 1. Small and exquisite, easy to use. 2. Colorful atmosphere lights make driving more romantic. 3. Compatible with Bluetooth, U disk (up to 32G) audio connection. 4. Support power-off memory playback function. 5. High-resolution, high-performance stereo, lossless music playback. 6. Bluetooth version 5.3 supports Bluetooth audio playback and Bluetooth hands-free calling. 7. 22.5W Super fast charging, charging while listening to songs. 8. The voice navigation function supports 99% of map applications. 9. Full-frequency FM wireless transmission technology, which can directly read audio files on Bluetooth mobile phones/U disks. 10. Multiple protections such as over-current, over-charge, over-temperature, over-voltage,short-circuit protection, and anti-combustion make it safer to use. 11. It is suitable for all cars, SUVs and trucks with a voltage of 12V-24V. Specifications: Model: C4 Material: ABS Color number of atmosphere lights: 7+1 mode Bluetooth version: Bluetooth 5.3 Charging interface: USB 15W charge+Type-C 15W Charge USB1 interface: 5V/3.1A USB2 interface: 5V/1.5A Type-C interface: 5V/3.1A Working Voltage: 12V-24V File type: MP3/WMA/WAV/FLAC/APE Transmitting frequency: 87.5-108.0MHz Functions: U disk, AUX in, FM, Bluetooth music, voice navigation, dual USB fast charging,hands-free calling, etc. Size: 4.9 x 4.9 x 8 cm Model: C4S Material: ABS Color number of atmosphere lights: 7+1 mode Bluetooth version: Bluetooth 5.3 Charging interface: USB 22.5W Super fast charging+PD 30W 22.5W interface: 4.5V/5A,5V/4.5A,9V/2.5A,12V/1.8A PD interface: 5V/4.5A,9V/3A,12V/2.5A Working Voltage: 12V-24V File type: MP3/WMA/WAV/FLAC/APE Transmitting frequency: 87.5-108.0MHz Functions: U disk, AUX in, FM, Bluetooth music, voice navigation, dual USB fast charging, hands-free calling, etc. Size: 4.9 x 4.9 x 8 cm