Outdoor PIR 10/20/30m - 33/66/98ft selectable. DI601 Outdoor PIR Detector is an outdoor motion detector and alarm trigger that uses two independent passive infrared detectors. Both sensors must trigger to cause the detector to signal an alarm. DI601 uses quad pyro technology to deliver precise, reliable presence detection. GRADE 2: EN 50130-5, Grade 2, Class IV.