The bike bells are easy to use, can meet your daily use and replacement, and you can use bells for multiple purposesUSB rechargeable: the bicycle bell built-in 250mAh lithium battery, USB rechargeable, 1 charging time can ring for approx. 2500 times (about 30 days for normal applied), you don't need to charge many times, suitable for outdoorsSafety switch: the control switch and the bicycle horn are separated; You can install the control switch next to your thumb, which is more convenient and safe; There are 3 modes that can switch; You can switch mode button to change modes, including whistles, horns and sirensQuality material: the bike bell is made of quality material, waterproof and dustproof, you can ride even on rainy days and snowy days; The compact size also makes it convenient to take; The bell can ring volume up to 110 - 130 db, you riding will be safer, which can effectively remind pedestrians to avoid trafficEasy to install: the bell is easy to install; Just put the bicycle bell on the handlebar and fix it with the silicone button; It takes only a few minutes to complete the installation without other tools; Because it's small, it doesn't take up much spacecolour:BlackMaterial:ABS+PCPackage Contents:2 x electric bike bells2 x straps2 x USB cableOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.