【Enhanced Visibility with High Brightness】 The rear bike light features a COB light source, ensuring a powerful and bright light with a wide 180-degree visibility angle. The addition of daytime running strobe lights enhances your visibility to other road users, keeping you safe during your rides.【Convenient Manual and Automatic Switching】 Switching between manual and automatic mode is as easy as double-clicking the button on this racing bike tail light. With built-in motion and light sensors, the light will automatically illuminate when your bike is in motion. After 30 seconds of inactivity, the rear light will automatically turn off. During manual mode, simply long press the button to turn the light on or off. Please note that the light cannot be manually turned off in automatic mode.【Versatile Lighting Modes】 With 6 lighting modes to choose from, you can customize your bike light according to your needs: ① Continuous light - 60LM / 5H ② Respiratory flash - 50LM / 9.3H ③ Comet flash - 50LM / 10.3H ④ Slow flash - 50LM / 9.1H ⑤ Mixed flash - 50LM / 11.6H ⑥ ECO flash - 30LM / 26.5H (For those who prefer a longer-lasting light for MTB rides, the sixth mode - ECO flashing mode - is the perfect choice.)【Waterproof and USB Rechargeable】 Designed with an IPX5 waterproof case, this bike taillight is built to withstand various weather conditions, making it your reliable companion even in bad weather. Charging the light for 1 hour and 40 minutes will provide an impressive battery life of 26.5 hours. You can easily recharge it using a power bank, USB charger, or your computer. Remember to fully charge it before the first use for optimal performance.