Ultra-light, compact and waterproof, with a removable head to allow you to direct light where it's needed. Powered by four lithium coin-cell batteries provide burn times up to 30 times greater than incandescent AA- or AAA-cell headlamps. Two impact resistant, high-output LEDs last forever and can generate three light levels and two emergency signals. Burn time = 24 to 48 hours. Batteries included. Weight: 1.8 oz.