When it’s in a cold environment, the electrolyte substance inside the battery thickens. Transferring ions in this thickened ...

Your smoke detector’s beeping is supposed to protect you, not confuse you. Yet there are moments when a chirping alarm is a ...

Carbon monoxide is quiet, fast, and unforgiving, which is why your detector has to be ready before the lights go out and the furnace, fireplace, or generator become your lifeline. The single most ...

The best smoke detectors are a necessity for every home, quickly detecting fire, smoke, and carbon monoxide to alert you to potential danger. As a residential carpenter, I've installed plenty of ...

Executive Editor David Carnoy has been a leading member of CNET's Reviews team since 2000. He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio products, ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...