The Smartwares RM149 sounds the alarm when it detects smoke. With its 85-decibel signal it'll have your attention immediately. The smoke detector runs on a 9V battery, which lasts about 1 year and is then easily replaced. Since the smoke detector runs on a battery, you can mount it to the ceiling without having to perform a technical installation. When the battery is empty, the smoke detector will emit a beep.
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