5 Modes Lights: This bike taillight comes with 5 options of lights. They are Day light1, Day light2, Soft light, Quick flash, Slow flash. You just need to press to change to the next mode. The sixth press is to turn off the taillight. You can install this tail light on all bikes, backpacks, pet collars or set posts for a warning mark. IPX4 Waterproof: Enhanced IPX4 waterproof/rainproof design is applied to this cycling light. Not only does it keep light compact through rainday, but also ensure safety by it's bright light modes. This makes the cycle light more durable and easy to clean. 14 LED Lamp Bead: This bicycle rear light comes with 14 small light bead which providing you 180 warning brightness to mark your position and remind the vehicles in your left, right or rear. Whether you're riding on a mountain road at dusk or in the rain, this bright LED bike light will be a good choice for you. USB Charging: Instead of the traditional clunky way of mounting batteries, an ordinary USB cable (included) gets full charged for 2-3 hrs and last about 56 hrs under the fifth light mode. You can connect the charging cable to a charging head/ power bank/ PC. High Quality Material: This cycle light is mainly made of high qulity aluminium alloy and PC (Polycarbonate) which supports a compact build. The anti-skid stand can be firmly fixed on the bicycle base or wheel frame to prevent shaking and reduce wear. Product Size:37X34X23mm Package include:1*Bike Lights+1*USB cable