Super Loud Ringtone: 120 decibels loud warning signal allows you to move freely on noisy streets. Just double-click to change the sound mode between 4 different ringtones.

200mah Lithium-ion Battery: The 200mah lithium-ion battery is built-in. Press 100 times a day to keep the bike bell on for 40 days. Charges via USB and you can fully charge in 20 minutes.

Warning: This powerful bike bell has an anti-theft function. If the anti-theft function is activated, a warning is automatically triggered when the bike is moved. Hold down the left button to turn on the alarm and hold down the right button to turn off the alarm.

Easy Installation: The bike bell is securely attached with silicone tape. Installation and disassembly are convenient and quick, and it is applicable to rails - guides with different diameters (approx. 22.2 mm ~ 31.8 mm).

Small and Practical: small and delicate bike belt approx. 60*34mm/2.36*1.34 inches. It can be hidden inside the handlebars without affecting the replacement of handlebar brakes or the function of other attachments. It is therefore perfect for your riding activities.