The Add-On Wireless Wide-Angle PIR (Passive Infra Red) Motion Sensing unit for Air-Alarm System by SecurityMan discovers an infrared-emitting source with one temperature, such as a body, that passes in front of a source with another temperature, such as a wall. It does not identify non-temerature things or real motion---- it identifies that something has broken the field which the sensor has actually identified as the "regular" state. The PIR sensing unit is set to spot rapid temperature modification, which indicates that it operates in the cases of invasion (Human) and fire.
|Box Dimensions||5.8" L x 2.7" W x 1.7" H|
|Qualifies for Free Shipping||Yes|
|Transmission Distance||450.00 FEET|
|Battery Information||Battery is packaged with product|
|# of Batteries Required||1|