When smoke enters the detector, it disrupts the flow of ... Instead of an electric circuit, photoelectric smoke alarms use a beam of light and a sensor to detect smoke particles.

A: Your question about whether to get photoelectric or ionization detectors is easiest to answer. A new testing standard for ...

It features a single button that has "hush," "test" and "reset" functionality and you can hardwire it to a 120-volt circuit ... Smoke detectors use various smoke-detecting mechanisms ...