1. USB electric speaker with alarm function
2. Built-in 200 mA lithium battery, press 100 times a day, can be used continuously for about 40 days
3. Suitable for a variety of tube diameter bicycle, quick installation and removal
4. One-button switch, switching mode is simple and clear
5. Material: ABS
6. Volume: 120 decibels
7. Battery: 200 mAh
8. Waterproof: IPX-4
9. Net weight: 25g
10. Size: 6.5 x 3.5cm
