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First Alert Battery-operated Ionization Sensor Smoke Detector

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Features an ionization sensor for smoke detection; a loud 85-decibel alarm sounds when smoke levels are elevated
Ionization sensor is effective in recognizing smoke from flaming fires such as paper and grease fires
9V battery-operated alarm unit provides continuous monitoring even if there's a power failure; plus, it's easy to install

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The First Alert SA303 battery powered smoke alarm. It features an ionization sensor for smoke detection and a loud 85-decibel alarm. It also includes a convenient single test/silence button for fast muting in the event of nuisance alarms from cooking smoke or shower steam. The battery-powered alarm doesn't require wiring to install and continues to monitor your home even if there's a power failure. The tamper-resistant alarm has an easy-access side battery drawer, so there's no need to remove the alarm from the ceiling to change the battery. Less than 12 inches (305mm) away from fluorescent lights. Electrical“noise” can interfere with the sensor.

Features an ionization sensor for smoke detection; a loud 85-decibel alarm sounds when smoke levels are elevated
Ionization sensor is effective in recognizing smoke from flaming fires such as paper and grease fires
9V battery-operated alarm unit provides continuous monitoring even if there's a power failure; plus, it's easy to install
Tamper-resistant alarm also features a single test/silence button, side battery door, and missing-battery guard
To ensure complete protection make sure to place one on each level of your home and in each bedroom
Tested to UL standards
Smoke and CO alarms should be placed on every level and in every bedroom of the home