mredz

Hi, Could I kindly request some advice please. I have 4 Messoa ndr891pro camera's setup. The motion detection is not reliable so I would like to add a PIR to one of the camera's. I'm wondering which PIR to use. Can someone please advise general suitability of the Digigard DG85 sensors: http://www.ebay.com.au/itm/WaterProof-Outdoor-Digital-Motion-Dual-PIR-Detector-Pet-Immunity-IP45-GU-/351640614246?hash=item51df69f566:g:FvMAAOSw--1Wqc-1 Thanks