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Chuango SMK-500 smoke detectorSmoke Detector, 315MHz, 85dB/3m, 20㎡, DC 9V The SMK-500 must be installed per NFPA instructions, and can only detect for smoke (not combustible fumes
Chuango SMK-609 smoke detectorWireless Smoke Detector - Photoelectric detector\n- Auto reset after alarm\n- Sound volume: 90dB/m\n- Power supply: 9V battery\n- Detection range: 20
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