Features: 1.Super Loud: 120dB loud enough to alert someone that a bike is coming, can be used in daily commuting, outdoor use. 2.Long Service Life: 5 different ringtones available, built?in 2032 button battery, nominal capacity of 10mAh battery. Super power saving, the battery lasts for one year. 3.Durable Material: This bike bell cover is made of soft silicone material, which will not damage the bike paint, water?resistant and dustproof design greatly extends the service life. 4.Wide Application: Small and portable, light weight, suitable for road bikes, mountain bikes, kids bikes, city bikes or other types. 5.Easy Installation: Easy to secure and remove, silicone cover is high?elastic so that to adjust different diameters, fits for most bike handlebars. Specification: Item Type: Bicycle bell Material: Silicone Volume: 120 decibels Ringtones: Five ringtones can be switched Battery Type: Button Cell (Built-in) Battery Model: 2032 button battery Nominal Battery Capacity: 10mAh PackageList: 1 x Bike Horn Bell