Ideal Detection Area The MX-40PI creates an integrated detection area. This enables the microwave detection area to synchronise to the PIR detection area, achieving higher detection performance and preventing errors and false alarms. Spherical Lens Design With uniform distance between each lens segment and the pyroelectric elements, the spherical lens provides a precise focal length to each of the multiple lens segments. This enables each lens segment to precisely face its detection area and creates detection zones without distortion, achieving a new level in lens design precision. The lens has a unique spherical design which makes it highly resistant to damage and outside disturbances. General Information Name: Optex MX-40PI Motion Sensor, Optex, Inc, Optex Category: Optex, Intrusion & Smart Home, Space/Perimeter Protection, Dual/Multi Tech PIRs UPC Code: 788924082486 Country of origin: China. Country of origin is subject to change.