Sensinova Is Most Excellent Company For Manufacturing Of PIR Sensor. It Is Producing Best Quality Products For Customers. Currently Sensinova Is A Good Supplier In India For Sensor Products.t Detects Changes In Amount Of IR Radiation, Which Is Depends Upon The Outside Characteristics And Temperature Of The Objects In Front Of Detector. It Means If Human Or Animal Will Come In Range Of Detector It Will Detect Movement Because Live Body Eliminates Warm Energy In Form Of IR Radiation. So It Will Give You Signal By Light Or Alarm When Any Live Object In Front Of PIR.