First Alert Wireless Onelink Smoke and Fire Detector, SA501CN-3ST

Uses photoelectric sensing technology which is environmentally friendlier. Optional theft prevention lock, when activated, batteries and or alarm cannot be removed without proper tool.

First Alert ONELINK SA500 Smoke Detector Input Voltage: 120 V AC Input Voltage: 120 V AC Form Factor: Ceiling Mount Form Factor: Ceiling Mount Sensing Technology: Photoelectric Sensing Technology: Photoelectric Product Color: White Product Color: White