[The latest generation update in 2019]: 120 decibels, louder; There are five possible ringtones to change the type. Press and hold the button for three seconds. Note: The ringtone may not be loud enough on streets with more cars. Children's bicycles can also be used. Waterproof (IPX4) and shockproof: The electric doorbell is waterproof and can be used on rainy days. Warning: do not immerse it directly in water. The bell is attached to the back with a hook. The silicone cover is elastic, so you can attach it to any size handlebar. Battery: two batteries and the battery life is 1 year. Product Description The Bell electric bike is fashion, rain, energy saving, high decibels, etc. After installing the bell, you can cycle safely and easily. Children's bicycles can also be used. Features: 1. Versatile for most bikes. Children's bicycles can also be used. 2,120 dB alert enough pedestrians and vehicles. 3. Easy and quick installation of the rear hook. 4. Waterproof, convenient for outdoor cycling. 5.5 interchangeable bell modes, low power consumption. 6. Small and exquisite appearance, simple and fashionable. 7. Silicone material does not hurt the handlebars, is stretchable and dimensionally stable. Technical data: Volume: 120 dB Material: elastic silicone gel Color: red, blue, green, black (optional) Item weight: 38g Package list: 1 * bicycle bell Built-in battery