Classic Glow Bicycle Light Front and Rear Aluminum LED Bike Light Set - Features 2 Front & 2 Rear Ultrabright Lights &mdash; Fits Bikes, Bicycle Helmets & Backpacks &mdash; Easy Installation EASY INSTALLATION: Our premium bicycle lights can be installed in seconds without the need for any tools or other equipment. Add a light to your bike, backpack, helmet or other areas for maximum safety. PREMIUM ALUMINUM ALLOY: Weve carefully crafted Classic Glow Bicycle Lights using durable aluminum alloy so they can stand up to weather, road use, and even low-impact drops. Theyre also waterproof! VERSATILE LIGHT MODES: Each of our lights feature three specific modes of usehigh, low and strobeso you can be easily seen in early morning fog, dusk, nighttime, and dawn. DESIGNED FOR SAFETY: These ultrabright LED lights feature two lithium ion batteries and offer visibility up to a half mile. This helps other riders, drivers, and walkers spot you when riding in low light or complete darkness. SATISFACTION GUARANTEE: If you arent completely happy with our LED lights, simply return them within 30 days for a full, no questions asked refund.