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| Product Name | Blue tooth Speaker |
| Model No. | S51pro |
| Bluetooth version | V5.2 |
| Charge voltage | DC 5V |
| Work voltage | 7.4V |
| Speaker | 4 40W |
| Battery capacity | 5200mAh |
| Transmission distance | 10m |
| Frequency response | 20Hz-20KHz |
| S/N | 85dB |
| Distorsion | <1% |
| Standby Time | 30 Days |
| Charging Time | 5-6 Hours |