ModelSB08ET81-642783404637 MTB Mountain Road Bike Electronic Horn USB Rechargeable Electric Scooter bike Handlebar Sound Alarm Ring Bell Feature: 1. Silicone strap can be adjusted in two gears, suitable for 22-31.8mm/0.87-1.25in handlebars; 2. Both buttons can control the horn; 3. Ultra long endurance: built in 280mAh lithium battery, equipped with standard for Android USB charging, 1.2 hours can be fully charged. It can ring 2000 times continuously after charging. About 20-30 days of normal use. The red light is on when charging, and the green light is on when fully charged. Specification: Material: ABS + PC Color: Black Size: 66x49x26mm/2.6x1.93x1.02in Net weight: 40g Decibel: 120dB Battery capacity: 280mAh Sound quantity: 1 style Note: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. 1 X bike Horn 1 X Chinese and English Manual 1 X Silicone Strap (random color) 1 X USB Charging Cable (random color)