Features: 90dB Sound, Replaceable Battery: 90dB is loud enough to alert someone that a bike is coming, can be used in daily commuting. 3 different ringtones are available, just long press for 3s to switch. Tips: the built-in battery is can changeable, please replace the lossy battery to obtain better effect if after a long time of transportation and storage. Water-Resistant Silicone Cover: This bike bell cover is made of soft silicone material, which will not damage the bike paint, the water-resistant and dustproof design greatly extends the service life. It is not recommended to get in the rain for a long time Mini and Useful: Small and portable, suitable for road bikes, mountain bikes, kids bikes, city bikes, or other types. It can be stored directly in a pocket or bag when not in use. 2 Easy Installation Ways: Easy to secure and remove, no tools needed, silicone cover is high-elastic so that you can adjust it to different diameters, great for most bike handlebars. Vertical installation and horizontal installation are available, more comfortable to use. Specifications: Material: Silicone Ringer Volume: 90dB Ringtones: 3 Application: for Road Bikes, Mountain Bikes, Folding Bikes, etc. Product Size: about 12 x 5 x 5cm/4.7 x 2.0 x 2.0in Notes: Please allow a slight dimension difference due to different manual measurements. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Package Contents: 1 x Bike BellNotice: 1. The monitors used are different, the computers are different, and the camera angles are different, there may be problems with the angle and color. 2. Purely manual measurement, there may be 0-1cm error.