A typical flashlight consists of a small incandescent lightbulb (or, in recent models, an LED) with associated parabolic reflector, powered by electric batteries, and with an electric power switch. The components are mounted in a housing that contains the necessary electric circuit and provides ease of handling, a means of access to the batteries for replacement, and a clear covering over the lightbulb for its protection. Since flashlight bulbs are often broken or burnt out, replacement flashlight bulbs are available.
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