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Most reviewers report random chirping. In my case, I replaced the battery and couldn't get it to stop chirping every minute, until I found this advice elsewhere on the web: 1. Unplug detector from power (or flip circuit breaker) 2. Remove battery 3. Hold down Test button for 20 seconds 4. Replace battery 5. Turn power/breaker back on This stopped mine from chirping every minute. Give it a try on yours.