Photoelectric Smoke Alarm Q1400 104mm diameter White
SKU: 215526MODEL: L130414
Available at Mitre 10 MEGA stores.
Photoelectric alarms have a sensing chamber which uses a beam of light and a light sensor. When smoke enters the chamber it changes the amount of light that reaches the sensor and the alarm sounds when the smoke reaches a certain level. They are best at detecting slow burning fires which burn for hours before bursting into flame.