Includes one super-bright white LED for brilliant illumination and one blue UV LED to identify counterfeit bills. Red dot point projects a line up to 100 yards. LED's use very little energy, prolonging battery life. Solid state LED technology has a typical lifetgime of 10+ years. Keychain attaches firmly to backpacks, purses and jackets. Batteries included (remove plastic disc in battery compartment to activate the light.)