6 Lighting Modes Our rear bike light has six lighting modes (strong light, medium light, low light, weak flash, strong flash, fast flash), the rear light lighting bike is bright and not dazzling, different Modes can be switched freely, suitable for a variety of road conditions.High Brightness 50 Lumens The Bike Rear Light uses high quality COB wicks with 50 lumens brightness, high brightness and long range. The bright bicycle rear lights can remind following vehicles to keep an effective distance to ensure safe riding; bright and eye-catching colors to guarantee even at night. There is no need to worry about safety when cycling, running or walking.IPX4 Water Resistant Our bike taillight has IPX4 water resistance function (not completely in water), it can be used even in adverse weather conditions such as strong rain, without fear of heavy rain or blizzards and your safety is fully guaranteed.USB Charging & Long Lasting Battery The battery capacity of the bike rear light is 400mA, with long life (high light 3h / medium light 5h / low light 10.5 h / low flash 23h / strong flash 5h / fast flash 4h), the bike taillight equipped with USB cable, can be charged with a variety of tools such as chargers, power banks, computers , etc Charging time is only 1.5 hours, convenient and fast.Wide Uses Our bicycle taillight is suitable for almost all types of bicycles. They can not only be used as bicycle taillights, but also widely used in outdoor activities. You can use them on a helmet as a warning light or in scenes like running, camping, walking the dog, etc.