ABS and Silicone|Two white LED lights|Silicone strap to attach to handlebars, seat posts and frame tubes|Two light modes: strobe and continuous on|Utilizes 2 CR2025 mercury free button cell batteries (inserted and protected by pull tab)|Water resistant|Can also be installed on backpack, helmet, etc.|Great for cycling, hiking and walking|Buy two and use one for a head light and one for a tail light