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 SILICONE ALLOY: We've carefully crafted Classic Glow Bicycle Lights using durable silicone alloy so they can stand up to weather, road use, and even low-impact drops. They're also waterproof. VERSATILE LIGHT MODES: Each of our lights feature three specific modes of use-high, low and strobe-so 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. Product material: shell silicone, inner shell ABS engineering plastic, circuit board, Lamp beads: LED, stable and durable, strong ductility, multi-functional fixing method, waterproof and anti-shower, easy to operate, Battery: Two AG-10 batteries.