This Bike Headligh is recharable and can last over 5-12 hours on a full charge. With LED technology, the light bulb will never need replacement. It has a strong 350 lumen front light and 5x 60 lumen red back light that shines wide. You can charge them with USB, which is handy for riding when it's dark. They have different light modes for wherever you ride. They're easy to put on your bike without any tools and they fit on lots of bikes like mountain bikes or road bikes. They're good in all kinds of weather because they're IPX5 rated. These lights help others see you and are a must-have for lighting up the front and back of your bike.