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1. Before the first use,please horn the bicycle full of electricity.
2.Open the USB waterproof plug and insert the charging line into the micro USB port.
3.Open the USB waterproof plug and insert the charging line into the micro USB port.
4.Four Kinds of Sounds Switchable - Metal bell, Trolleybus bell, Vibrating bell and Horn,
5. Electric horn can reach 120 db, delivers enough loud ring tones, catch attention of pedestrian and cars easily, give you a fun and safe cycling on the road.
6. USB Charging Bicycle Handlebar Electric Bell Waterproof MTB Mountain Road Bike Safety Alarm Horn