escription: Power save Waterproof, but not support soak Can take off/on by hand Also can use as the safe-light Patterns is clear and completely when speed up to 20kms/h Equipped with light sensor and movement sensor, flash only at night and action It will not work and save power when not riding Battery: Operated by 1x AAA (Included), could be max to 12h when it works Specification: Pattern is clear & completely when speed up to 20kms/hour Consist of 14 pcs colorful LEDs, each side have 7 LEDS light It can flash 30 different patterns, and the patterns will be changed every 4 seconds Note: The battery is not included Package Included: 1 X LED Wheel Tire Signal Spoke Light