Dual‑Power Smoke Alarm 220V AC Main with 9V DC Backup Battery 85dB High‑Sensitive Smoke Detector Low Voltage Reminder Fire Alarm Sensor for Home Apartment Store Warehouse Ceiling Safety Monitoring

Stay protected with this universal photoelectric smoke alarm designed for reliable early detection—especially effective for smoldering fires that can build up for hours before turning into a larger incident. With dual power support (220V mains + 9V battery), it helps ensure consistent operation when you need it most.Key Features - Photoelectric smoke detection: Better suited for smoldering fires (e.g., cigarettes burning in couches or bedding)- Dual-power system: AC 220V mains power + DC 9V battery backup for added reliability- Low-voltage alarm: 6.5V–7.5V- Alarm sound level: >85 dB (3m)Power & Electrical Specs - DC power: DC 9V- Static current: - Alarm current: - AC power: 220V- Current: - Working temperature: -10 to 50℃Where to Install (Important) - Install at least one smoke alarm in every bedroom- Install in bedrooms and passageways/routeways- Install in stairways (critical for safe evacuation)- Install at least one alarm on every floor, including finished attics and basements- Install beside every electrical facility- Install in the middle of the ceiling (smoke, heat, and light rise to the top of rooms)- If ceiling installation isn’t possible: install at least 10 cm away from the wall- If installed on a wall: position 10–30.5 cm below the ceiling- For halls longer than 9 m: install more than one alarm- For rooms with sloped roofs: install 0.9 m away from the top- Removable/insulation-limited houses: install 10–30.5 cm away from the ceiling for safetyImportant Safety Notes - This user manual contains important operation information for your smoke alarm. Keep it.- To ensure safety, install at least one alarm in every room.- Do not open the smoke alarm, as it may cause improper performance.- If installing for others, leave this manual (or a copy) with the end user.