A flashlight (more often called a torch
outside North America) is a portable hand-held electric light. Usually,
the source of the light is a small incandescent light bulb or
light-emitting diode (LED). A typical flashlight consists of a light
bulb mounted in a reflector, a transparent cover (sometimes combined
with a lens) to protect the light source and reflector, a battery, and a
switch. These are supported and protected by a case.