First Alert CO400-3 Battery Powered Carbon Monoxide Alarm, 3-Pack, White, Pack of 3

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Product description
- Compliant with CO laws in California, Wisconsin, and Oregon (and other states with CO law)
- Uses electrochemical carbon monoxide sensor--the most accurate technology available
- End-of-life timer and low battery warning; Includes 1-9V battery per alarm (battery updated from 2-AA to 1-9V in Nov 2013);
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