1. Bluetooth chip: Jerry AC6966B 2. Bluetooth version: V5.1 3. Speaker size: 57x57mm 4. Battery capacity: 2400mAh/3.7V 5. Speaker power: 10Wx2 6. Sound channel system: dual speakers + diaphragm 7. Bluetooth working frequency: 2402MHZ-2480MHZ 8. Frequency response: 80Hz-18KHz 9. Frequency response: 60Hz-18KHz 10. Play time: 7.5-8h (70% volume) 11. Charging time: 3.5-4h 12. Waterproof level: IPX6 13. Handle design makes it easy to carry and hang on the wall 14. Playback method: Bluetooth connection, USB card reader, TF card, AUX 15. Support mobile phone battery indicator and connect Bluetooth device for stereo sound 16. Two machines can be connected in series wirelessly to form a 2.0 Bluetooth speaker effect.