Number of sensor: 4 sensors (can option 4, 6, 8 and wireless 4 sensors) Beeping alert: BI-BI-BI or speaker voice warning Kind of display: LCD (Red, Purple, Blue) 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 Gift Box