... 2.12-24 VDC 3.waterproof Best-selling Active Infrared Detector CY-M001Infrared Frequancy : 1.92khzPower supply : 12 to 24 VDC ... conditions : for rain ,dust ,etc Single beam sensor/single beam detector is used for automatic slide door, coil door , garage door ... windows etc.Single beam sensor/single beam detector is used for automatic slide door, coil door , garage door ...