LIFE SAVER: The alarm tone (85 dB) sounds as soon as too many visible smoke particles enter the detector's measuring chamber - visual smoke alarm for a safe home 10 YEAR BATTERY: constant functional reliability thanks to long-term battery - 10-year 3 V lithium battery is permanently installed | warning tone when battery level is low CERTIFIED: excellent smoke detector is certified by VdS - tested according to standard EN 14604 and VdS guideline 3131 PRODUCT DETAILS: reliable detector - diameter 10 cm, height 3.6 cm, weight 200 g, LED light flashes every few minutes, colour pure white TEST WINNER: awarded a grade of 1.9 by Stiftung Warentest in the 01/2021 issue
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