Features1This rear view mirror can be mounted on the handlebars. 2It can be rotated 360 degrees and you can see the distance of 20-40m behind. 3Suitable for 21-22mm handlebar bicycle. 4Waterproof and non-slip light button for long service time. 5Easy to install. 63 light modes adjustable.SpecificationThis bicycle rear view mirror is easy to install and it will make your riding safer, the mirror can be closed so it won't increase the resistance of riding.Features:This rear view mirror can be mounted on the handlebars.It can be rotated 360 degrees and you can see the distance of 20-40m behind.Suitable for 21-22mm handlebar bicycle.Waterproof and non-slip light button for long service time.Easy to install.3 light modes adjustable.Specifications:Color: blackMaterial: PVC, acrylicBattery: 1 * CR2032, 3V, 240mAhItem size: 40 * 29mm / 1.6 * 1.1inItem weight: 16g / 0.6ouncePackage size: 70 * 50 * 30mm / 2.8 * 2.0 * 1.2inPackage weight: 50g / 1.8ouncePacking List:1 * Handlebar LightPackage List1 * Handlebar Light