Spiraling patterns of light appear in your bike wheel as you pedal. Vibrant, multi-color rings of light appear on any standard bike wheel (18" and up). Gyro Flashers mount directly to wheel spokes, and the two ultra-bright RGB LEDs make unique patterns of spiraling light as you ride. They are the cool and colorful way to trick out any bike.The Gyro Flasher is 200% brighter than other color changing spoke lights on the market. Rather than using button cell batteries that have only 4 or 5 hours of battery life, the Gyro Flasher uses AAA batteries and offers more than 50 hours of constant use. Don" be fooled by other cheaper products, the Gyro Flasher is rigidly constructed and built to last. You will not be disappointed.