Parameters:
1. Bluetooth version: 5.2
2. Transmission distance: about 10m
3. Playing time: about 3-5H
4. Charging time: about 3H
5. Signal-to-noise ratio: greater than or equal to 85dB
6. Working voltage: 3.7V
7. Frequency response: 20Hz-20KHz
8. Battery capacity: 4000mAh
9. Speaker: 57mmx2x10
10. Distortion: less than 1%
11. Function: Bluetooth / card / U disk / data transmission
12. Size: 86x86x204mm
13. Weight: 780g

Features:
1. Bluetooth: Stream music wirelessly from your smartphone, tablet, or any other Bluetooth-enabled device without interference.
2. Waterproof: The speaker has a built-in waterproof TPU membrane, which is designed to prevent water from entering your device.
3. Loud sound: The sound of this bluetooth speaker is very loud and can be heard through various speakers.
4. Easy to carry: The portable speaker is easy to carry and store. Lanyard design, you can put it on your backpack, handbag or bike.

Parts List:
- Bluetooth speaker x 1
- Type-C charging cable x 1
- Lanyard x 1
- User Manual x 1
- Box x 1