How to check Expiration & Properly remove Smoke Detector! - YouTube
Should I replace a smoke detector that fell off the ceiling onto the ground? Could its detection ability be compromised, even if the battery/test button still works? - Quora
Do Smoke Detectors Expire?
First Alert Brk 10-Year Battery Hardwired Photoelectric Sensor Smoke Detector in the Smoke Detectors department at Lowes.com
Jemay Fire Alarm Battery Operated, Smoke Alarm with Enhanced Photoelectric Sensor, Mini Smoke Detector Fire Alarm with LED Indicator & Silence Button - Amazon.com
Product: P1210 / PR710 / PR710B
Check your smoke detector age! It could save a life! - Spot On Inspection