With 7 colors, 18 different images and 2 modes to choose from, this unique bicycle wheel light will bring more fun and safety to your monotonous journey in the dark night whether you are alone or not. 550mAh lithium battery, long battery life; USB charging, 5-20 hours working time, saving you time to replace the battery. IP65 waterproof, can be used normally in rainy days (do not soak in water). Thanks to this bright LED light, your bike wheel is always visible at night, making your riding safer. Easy to install, it does not affect the bike's center of gravity: more than 95% of bicycles are universal, such as road bikes, mountain bikes, BMX, hybrid bikes and even children's bikes . Suitable hub diameter: 19mm~36mm. With no speed requirement, even if the bike has parked, the bike wheel lights are just as beautiful. You can choose flashing or steady mode using the switch. It is also a great gift for your friends and family. Explanation: 1.In off state, short press to select color. You have the choice between red, green, blue, pink, yellow, navy, white and RGB. Also, long press to turn it off. 2.After closing, press and hold for 3 seconds to switch modes. There are 18 images to choose from and the color changes automatically. 3.Working time: 5-20 hours (Note: different light modes have different power consumption times). 4.When the light is red, charging is in progress, and when the light is green, the battery is fully charged. Features: *Product Name: USB Bicycle Wheel Light *Model: L05B *Size: 10.6 x 2cm *Number of LEDs: 7 RGBLED *Color: 8 colors, 18 images *Battery: 550mAh lithium battery *Fully waterproof design *Install Caliber: 19 - 36mm Setup: 1.Open the hub light and attach a rubber pad to the inner ring 2.Put the light on the hub 3.Tighten the screws to make them stronger Package includes: *1 x CestMall USB Bike Wheel Light *1 x USB charging cable *1 x professional screwdriver *1 x Allen screw *5 x rubber mats