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Description: Features: - Design with small size and modern fashion look.built in boost circuit with loud sound reached 130 db - Separated control button.Install it to any position you like. - Moderate frequency Sound, Not harsh and clear enough. - Long working life,charging & discharging over 300 times.press over 20 million times,stand by over 180 days. Specifications: Color: Black Material: ABS Plastic Size: 50*65mm Decibel:130db Charging time:1.2 hour For Handlebar: 22-31.8mm diameter Charging Voltage & Current: 5V-250mAh Charging indicator: Red (Charging), Green (Full) Package List: 1x Electric bike horn 1x Silicone rubber band 1x USB charging cable 1x User Manual Notes: 1.Charging Indication Before the first use,please full charge the electric bike bell 2.When the charge is complete,unplug the charging line and make sure the USB plug is covered