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Number of sensor 4 sensors Kind of Display VFD Operating voltage 10.8V—15V Max. Consumption 10W Operating temperature -30? ~ +70? Buzzer volume ?80db Max. detection distance (Suppose the detection target is a flat wall area) 2.0M Human body detection distance 1.2—1.5M Verbal alarm function Provided Temperature display feature Provided Temperature display tolerance ±1 ? Mulfunction alert Provided