Truly tiny, the Streamlight Nanolight is a weatherproof, personal flashlight featuring a 100,000 hour life LED. The Nanolight includes a non-rotating snap hook for easy one handed peration when attached to a keychain. Easily attaches/detaches to just about anything with convenient pocket clip or key ring Up to 8 hrs. run time Machined aircraft-grade aluminum with anodized finish Powered by 4 alkaline button cells (included) 100,000 hr. lifetime high-intensity LED