Truly tiny, the nano light is a weatherproof, personal, machined aluminum, one LED flashlight. The light has a 1 ultra-bright White LEDs and delivers 10 lumens. Easily attaches/detaches to just about anything with pocket clip or key ring. Specifications – Weight (w/ battery): 0.36 oz, O.A.L.: 1.47". Run time: 8 hours. Powered by (4) Button size alkaline batteries included. UL listed.