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Dahua FAD122A-W

Infrared photoelectric sensor
MCU processing, eliminate false alarm
Surface-mount device(SMD) circuit board design
High detection sensitivity
Simple ceiling installation using a dedicated bracket
Up to 3 years battery life using a 3.6V lithium battery
Low battery indication at least 30 days from warning signal
Carrier Frequency: 433 MHz, 150m transmission distance (open space)
Alarm Sound level 80dB 3m(10 feet)