This is a must-have item for any home or car. Always have a flashlight and batteries on hand in case of a power outage or emergency. A flashlight can be used to light up a dark area, signal for help, or provide a source of light in the event of a power
From Wikipedia
A flashlight or electric torch, usually shortened to torch, is a portable hand-held electric lamp. Formerly, the light source typically was a miniature incandescent light bulb, but these have been displaced by light-emitting diodes (LEDs) since the early 2000s. A typical flashlight consists of the light source mounted in a reflector, a transparent cover to protect the light source and reflector, a battery, and a switch, all enclosed in a case.