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A part of Alfawise PG – 105 security alarm system, check the home security situation anywhere, instantly emit an alarm when smoke is detected, can be matched with almost all home security gateways, will not scare the elderly and children, 75dB alarm sound, 1 year battery life, no need to change batteries frequently, Sensitive smoke detection, Universal 433mHz frequency, Sound alarm and App alarm (need 433mHz gateway)
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