dobestyou 2pcs Colorful LED Bike Wheel LightPower source: each light string using 1 section of 2032 button batteries Use time: More than 20 hours Flashing mode: fast flashing slow flashing long bright (press the middle button to switch to change the mode, etc.) Material: PP Waterproof level: IP65 (normal use in the rain) Size:8*12cm Weight:86.2g Do..