Home protection: Two standalone units safeguard separate floors without requiring any mains wiring or interlinking Fire alert: An integrated photoelectric sensor registers smoke early while keeping false alarms to a minimum Loud siren: An 85 dB acoustic signal at 3 m warns residents immediately, complemented by clear beeps when batteries need replacing Hush mode: Decrease sensitivity for 10 minutes during a false alarm, and use the integrated button to test device readiness Service life: The detector functions for 10 years, powered by an included replaceable 9 V 6F22 battery with 1 year of runtime
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