How-To Geek on MSN

Here's the Easiest Way to Check if Your TV Remote's Batteries Are Dead

While infrared light isn’t visible to our eyes, most cameras can see IR light just fine. This means that you can easily point ...
TechHive

Use your smartphone to check your remote control batteries

Most standard remote controls send signals to your home theater gear using a beam of infrared light, which a sensor on your hardware picks up. You can’t see this beam, but your smartphone’s camera can ...