The rays of infrared light are invisible and are also known as heat rays. Find out what's infrared light and how it works.
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The rays of infrared light are invisible and are also known as heat rays. Find out what's infrared light and how it works.
The information on this page applies to the following models: HP3643/01 , HP3616/01 , HP3621/01 . Click here to show more product numbers ›
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