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Nivian Smart Photoelectric smoke detector Wireless via radio 433 MHz Internal antenna Auto Reset after alarm Built-in siren Can function independently Power supply 2 AA batteries 1.5V Features Nivian Smart Smoke detector Built-in siren and LED Central or stand-alone operation Wireless 433MHz Compatible with Nivian Smart Alarm Panel Specs Brand Nivian Smart Frequency 433 MHz Smoke Sensitivity 0.09~0.16dM/m Internal siren 85dB (at 3m) Transmission distance ≤ 100 m in open space Battery 2 AA batteries 1.5V Power consumption Sleep mode ≤ 4uA Alarm ≤ 40mA Certification EN 14604:2005