Product Description: 1. Bluetooth Bluetooth V5.0. 2. Dual display digital tube display. 3. Support QC3.0 quick charge. 4. Support PD fast charging. 5. Support voice assistant function. 6. Support one-key soft stop, support any key to start. 7. Supports ambient light. 8. Battery voltage detection. 9. Auto power off memory function. 10. Support stereo FM transmission technology. 11. Support U disk playback. 12. Support TF card music playback. 13. Support WMA, MP3, WAV, FLAC music format files. 14. Bluetooth supports A2DP, AVRCP, HFP, HSP. 15. Bluetooth hands-free calling. 16. Support Bluetooth stereo music DSP technology. Technical parameter: Rated working voltage: 12V~24V Limit working voltage: 10-26V PD Output Power: 18W USB Output Power: 5W + 18W Working temperature: 0-50 degrees Music playback format: MP3/WMA/WAV/FLAC Signal to noise ratio: > 60 dB Battery voltage error: 0.5V USB1: U disk/5V/1A USB2: QC3.0 (3.6V-12V) Bluetooth version: 5.0 version Bluetooth sound processing: with DSP technology and A2DP (Advance Audio Distribution Profile) function