Introducing the SUPERFIRE Rechargeable LED Bicycle Tail Light BTLO1: Compact and lightweight, it easily attaches to bicycles, helmets, or backpacks. With 4 brightness levels including full, slow flashing, fast flashing, and half brightness, it offers versatile illumination. Enjoy 4.5 hours of standby time with just 0.5 hours of charging. Waterproof at level IP44, it's ideal for rainy days. Installation is a breeze with simple steps. Perfect for various scenarios including bicycle lighting, outdoor activities, and even pet illumination. Enhance your visibility and safety with the BTLO1 Tail Light.