1. Support A2DP, AVRCP and Handsfree Profile protocols 2. Bluetooth version: V5.0 + EDR class 2 3. Scope of work: up to 10 meters 4. Product packaging size: 22.4 * 9.9 * 7.5cm bare machine size: 180mm * 63mm * 63mm 6 . Speaker: 40mm 7. Speaker output: 2 * 3 8. Frequency: 280hz-16khz 9. SNR: ≥ 95dB 10. Distortion: ≤ 0.5% 11. Battery capacity: 1800mAh 12. Charging voltage: 5V ± 0.5V 13. Charging time: 4 hours 14. Working hours: 10 hours 15. Standby time: 200 hours