Number of sensor: 4 sensors (can option 2, 4, 6, 8 and wireless 4 sensors)
Beeping alert: BI-BI-BI
Operating voltage: 10.8-15V
Max. Consumption: 2W
Operating temperature: -40 -- +80 degree Celsius
Buzzer volume: about 80db
Max. detection distance (Suppose the detection target is a flat wall area): 2.0M
Human body detection distance: 1.2-1.5M