USB RECHARGEABLE: Forget about disposable batteries. The LED taillight feature a built-in USB-rechargeable (USB-C) battery, offering long-lasting illumination for your rides LIGHTING MODES: Easily switch between steady-1/2steady-flash-off modes to adapt to your riding conditions, extending battery life without sacrificing brightness WATER RESISTANCE DESIGN: Engineered with IPX4 water-resistance, these lights can withstand rain and splashes, making them ideal for all-weather cycling QUICK AND EASY INSTALLATION: The versatile mounting system allows for fast and tool-free attachment to seat posts. In addition, the taillight fits a wide range of bicycles BV PROMISE - We invest a lot in the high quality and reliability of our products, but unfortunately we cannot completely rule out problems. If you have any problems with our product, please contact our customer service and we will find a solution for you. USB RECHARGEABLE: Forget about disposable batteries. The LED taillight feature a built-in USB-rechargeable (USB-C) battery, offering long-lasting illumination for your rides LIGHTING MODES: Easily switch between steady-1/2steady-flash-off modes to adapt to your riding conditions, extending battery life without sacrificing brightness WATER RESISTANCE DESIGN: Engineered with IPX4 water-resistance, these lights can withstand rain and splashes, making them ideal for all-weather cycling QUICK AND EASY INSTALLATION: The versatile mounting system allows for fast and tool-free attachment to seat posts. In addition, the taillight fits a wide range of bicycles BV PROMISE - We invest a lot in the high quality and reliability of our products, but unfortunately we cannot completely rule out problems. If you have any problems with our product, please contact our customer service and we will find a solution for you.