HUGEOAKS TL Red Bicycle TailLight, Changeable Pattern, Rechargeable, IPX6 Waterproof, Built-in 1100mAh Battery

Variable pattern: you can choose to change the pattern of the taillights
Endurance: Steady on with maximum brightness, continuous working time of 25 hours
Multiple installation options: TL can be mounted on saddles, seatposts, and backpacks
Daylight visibility: Increased safety, riding with a bright taillight is just as important in the daytime as it is at night
Convenient USB charging: When the battery is below 30%, a low battery indicator light will illuminate, you can charge it through the included USB charging cable, no need to replace the battery regularly