Truly tiny, weatherproof, personal flashlight featuring a 100,000 hour life LED. Includes a non-rotating snap hook for easy one handed operation when attached to a keychain. Batteries included (LR41). Machined aircraft-grade aluminum with black anodized finish. 5 mm white LED, impervious to shock. Light output: 10 lumens. 1.47 inch length. 0.51 inch head diameter, 0.43 inch body diameter.