How long do FireAngel batteries last? The alarm makes use of the most recent optical detecting technology and a thermally improved smoke sensor for quicker detection of smoldering fires. It is BS EN 14604 Kitemarked and CE marked. The alarm is perfect for places around the kitchen but not for garages or kitchens themselves. Extra features like the simple test/hush button and the “sleep-easy” mode, which silences low battery warning chirps for eight hours, provide additional benefits. What are the differences – FireAngel ST-620 vs ST-622 smoke alarm?
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