6 modes and stand by long time: The bicycle light has 6 lighting modes to choose from: strong light, medium light, low light, weak flash, strong flash, and strong flash. Multiple modes can be switched freely, suitable for a variety of road conditions and scenes. The bicycle taillight is powered by a safe and reliable 400mAh lithium battery, which can provide up to 23 hours of lighting.High-brightness and wide field of view: The taillight adopts high-brightness COB LED, 50 BRIGHT lumens, 120 degree wide field of view, visibility up to 150m, can provide excellent brightness, visible from a long distance. Bright and eye-catching taillights can remind vehicles behind to keep their true distance. Whether you ride a bike at night or in the morning, it will stay safe.Waterproof and USB charging: It adopts a high-sealed structure, IPX4 waterproof, and the tail light can also be used in fog and light rain. You can charge it via a computer, a mobile power bank, or any device with a USB port. A full charge only takes 2 hours, and you can enjoy 3-23 hours of lighting. The light will display the charging status, and the power supply will stop automatically when charging is completed.Easy to install and widely used: The taillight is compact in structure, light in weight, and very easy to transport, install and disassemble. It is equipped with a sturdy rubber stand. It can be installed as a bicycle frame, front fork, seatpost, handlebar or helmet in a few seconds. Suitable for all types of bicycles, including road bikes and mountain bikes.Material:plasticcolour:BlackPackage Contents:1 x Bicycle tail light1 x Tie1 x USB cable(The color is random and cannot be selected and specified)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.