Piercingly bright light comes from 21 super bright and very white LEDs, and each of these LED lights has a life of expectndacy 100,000 hours so you’ll never replace a bulb again. A 90 degree tilting head lets you zero in on the source you’re illuminating. Contructed of a virtually indestructible polymer, the new Cyba has fully adjustable straps for the ultimate in hands free LED Lighting. it is also, water resistant. Features: Plastic/ with Adjustable Head Strap Water Resistant Bulb Type 21 x 05mm White LED Battery Type 2 x 1.5V “AA” Size Battery (not included) DC-DC circuit maintains light output throughout battery life. Product Size 3 ” (width) x 1 3/4″ (height) x 2 1/2″ (depth) 1 1/2″ (lens diameter) Weight (batteries installed) 4 1/2 oz