Low power alert
The buzzer sounds once every minute
How to charge
Standard 5V charging,current is not limited,you can use phone charger.The indicator light is red when charging,red is off after charging

Name: Bicycle electric horn
Battery capacity: 3.7V 1600mA

Life time: more than 100 days for bike bell with alarm. 180 days for only bell pattern.
Features: large-capacity battery, long battery life, waterproof design, anti-theft alarm,
comparable to the electric bikes horn effect
2 Type controller, touch alarm, lock on key and the release key is remote control, distant long than 30 meter

Packing list:
1 x Bike bell
1 x Charging cable
2 x Remote control (bell with alarm including，only bell model not including controller)
1 x Fixed gasket
1 x Fixed belt

Small volume of shape,big volume of sound,
comparable to the electric bikes horn effect.
Durable and Convenience: 1300 mAh lithium battery ,can be android phone USB rechargeable,can be sound 2000 times,about 20-30 days. Alarm standby 150h, charge and discharge time more than 300 times.
IPX4 Waterproof,Anti-Drop,
2 Type controller, touch alarm, lock on key and the release key is remote control, distant long than 30 meter.
Installation and Removal Easily:rubber band,fits for mountain bike,road bike,bicyle which handlebar is 22-31.8mm diameter