1、Waterproof, no fear of water and rain. 2、Can be used for night mountaineering, Cycle, running, balance bike, patrol and other night safety warnings. 3、Strong compatibility, no choice of models, wire wheel/integrated wheel can be installed, can also be used to wear ginseng. 4、Intelligent design, not bright during the day and bright at night. 5、4LED lamp beads, high brightness and long service time. 6、When movement is detected, the light is on, and when movement stops, the light slowly goes off. There are three fixed ways, which can be installed anywhere you want, integrated wheel, spoke wheel can be installed, also can be taillights, night running lights, patrol lights, etc. Features: Waterproof, no fear of water and rain. Can be used for night mountaineering, Cycle, running, balance bike, patrol and other night safety warnings. Strong compatibility, no choice of models, wire wheel/integrated wheel can be installed, can also be used to wear ginseng. Intelligent design, not bright during the day and bright at night. 4LED lamp beads, high brightness and long service time. When movement is detected, the light is on, and when movement stops, the light slowly goes off. Specifications: Color: red, blue, green (optional) Material: ABS Battery: 1 * CR2032, 3V, 240mAh Item size: 33 * 31 * 15mm / 1.3 * 1.2 * 0.6in Item weight: 14g / 0.5ounce Package size: 50 * 40 * 20mm / 2.0 * 1.6 * 0.8in Package weight: 14g / 0.5ounce Packing List: 1 * Bicycle Wheel Light 1 * Bicycle Wheel Light