Feature: 1. This rear view mirror can be mounted on the handlebars. 2. It can be rotated 360 degrees and you can see the distance of 20-40m behind. 3. Suitable for 21-22mm handlebar bicycle. 4. Waterproof and non-slip light button for long service time. 5. Easy to install. 6. 3 light modes adjustable. Specification: This 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: black Material: PVC, acrylic Battery: 1 * CR2032, 3V, 240mAh Item size: 40 * 29mm / 1.6 * 1.1in Item weight: 16g / 0.6ounce Package size: 70 * 50 * 30mm / 2.8 * 2.0 * 1.2in Package weight: 50g / 1.8ounce Packing List: 1 * Handlebar Light Package List: 1 * Handlebar Light