DAWAY A08 Bike Tire Valve Stem Light - LED Waterproof Bicycle Wheel Lights Neon Flashing Lamp Glow in The Dark Cool Safe Accessories (1 Pack, Blue+Letters) AUTO OPEN & CLOSE, ENERGY SAVING! Controlled by light and dynamic sensor automatically. When bike moves at night or moves in dark area, DAWAY A08 led bicycle wheel light will light intelligently. When bike stop or at daytime, bike wheel lights will be off within 1 minute. How convenient and energy saving ULTRA BRIGHT, DIFFERENT SPEED, DIFFERENT EFFECT SHOW! Daway a08 led bike valve stem light has five styles to be selected. High brightness lights gain increased visibility from all directions, great for night cycling. As picture shows, different speed will have different pattern effects. The faster the speed is, the more complete the pattern appears MANY PATTERNS CHANGE AUTOMATICALLY. If you select graphics pattern bike tire lights, when you are riding, 15 kinds of different graphics change once every 3 seconds. If you choose letter pattern bicycle tire light, when you are riding, 4 kinds of letter pattern will change automatically, too. Cool and love, be the most unique UNIVERSAL VALVE PORT. Daway a08 led bicycle wheel light uses 2 in 1 interface design, whether the valve of your bike is Presta valve or Schrader valve, whether your bike is mountain bike, road bike, kids bike or ordinary bike, this bike valve cap light can be perfectly matched WATERPROOF, EASY INSTALL, QUALITY GUARANTEE. This led bicycle tire light is life waterproof. Don't worry about riding in rainy days. No need any tools, this bike valve light can be installed or removed easily. Only includes 1 pcs bicycle wheel light. Batteries included! Best Festival or Birthday gifts for your lover, kids or friends. If have any problems, pls contact us by email, 100% refund or replace