Home Emergency Light Safe lighting during a power failure Don't be left in the dark during a power failure! The new Lifesaver Home Emergency Light has two batteries that are kept fully charged via the mains. When a power failure occurs, the light switches on automatically, providing up to an hour of safe, convenient illumination. Cat. No. CNS1 Features Comes complete with spare lamp and two Nickel Cadmium rechargeable batteries. Provides an hour of emergency lighting after a mains failure. Test switch to check lamp. Red LED to indicate batteries are being charged and confirms circuit continuity with the lamp. Ideal for rooms, entrances, stairs, or any other location in which safety lighting would be beneficial in a blackout.