A photoelectric alarm uses a beam of light. When the beam ... for fire or carbon monoxide. This smoke alarm is inexpensive, yet offers excellent value and solid features. Hardwired, it has an ...

He is in charge of developing and carrying out testing procedures for a wide variety of home appliances and smart devices including robot vacuums, smoke/CO detectors and air conditioning units.

Learn more The best smoke ... alarm could be clearly heard from across the 2,700-square-foot house I tested it in, and its red LED flashed continuously while the alarm was sounding. The alarm and ...