No other warning light in modern life behaves quite like this one. A low battery icon tells you exactly what's wrong and exactly how long you have. A smoke detector screams until someone deals with it ...

We tested 50 air purifiers to find the best for removing dust, pollen, pet dander, smoke, and odors, with picks for bedrooms, ...

Carbon monoxide detectors can emit various types of beeps. Some are relatively innocuous, while others are high-priority alerts that you should not ignore.

Whether you want to track your stress, sleep, heart rate, steps or more, these are our favorite fitness trackers.