Features1Split type multi-function key, increase cycling safety. 2The split-type handlebar controller, which is separated from the speaker, installed next to the thumb of the handlebar for easy keystroke and sound switching. 3Waterproof, drop-proof and dust-proof, meet normal daily use. Please close the waterproof cover after charging so as not to wash out the rainwater. 4USB charging, 180 days standby, built-in 280mAh lithium battery, equipped with standard micro USB port, 1.2 hours can be full charged, charging once that can be continuous ringing 2000 times, about 20-30 days normal use. Red light on when charging, green light onwhen charged full. 5Suitable for bike, electric scooter.SpecificationItem type:BikeElectric Horn Material:ABS+PCWeight: Approx. 69gColor: As picture shownSize: Approx. 7.5x5x2cm/3x2x0.8inPackage List1 xElectric Horn1 x Instruction1 x USB cable1 x Rubber ring