The Pelican™ 1810 keychain light uses 4 button cell batteries (included) to bring you 16 lumens of light. It runs for 8 hours and 45 minutes with a distance of 23 meters. It has a simple rotary twist-action on / off switch and an IPX4 water resistance rating. The body is made from machined aluminum and includes a steel clip for easy attachment. Use it as a keyring and light up your world.