9-Volt Battery Operated Smoke Detector with Photoelectric Sensor
85% off — well into the markdown cycle. 2 active.
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Scanning Home Depot stores hourly. 2 active Universal Security Instruments finds as of right now.
Universal Security Instruments
85% off · deepest active 
Universal Security Instruments Find of the day
Hardwired and 3-Year Replaceable Battery Backup Combination Smoke and Carbon Monoxide Detector w/ Voice Alarm
85% off — well into the markdown cycle. 3 active.
More Universal Security Instruments finds today · 1 more
See all Universal Security Instruments About Universal Security Instruments
Home Depot marks Universal Security Instruments Universal Security Instruments products through a predictable four-step cycle: 25% off → 50% → 75% → penny pricing ($0.01). Most Universal Security Instruments markdowns aren't advertised — they only show up on the shelf tag or in the Home Depot app.
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