Photoelectric alarms are safety devices that detect smoke or fire using a light-sensing technology. They work by shining a light beam into a sensing chamber. When smoke enters the chamber, it scatters the light, triggering the alarm to sound. This type of alarm is particularly effective for detecting smoldering fires, which produce more smoke before bursting into flames. These alarms are often preferred for their quick response time and reliability. They can be powered by batteries or connected to a home’s electrical system. Regular maintenance, such as testing and replacing batteries, is essential to ensure they function properly when needed.