I've went through a few cheap sensors. Don't waste your money. The optex sensors work great, last for many years( oldest set I have is 10 yo. Works fine) 2000' line of site range. Wide and narrow FOV and will accept 8 sensors on 4 zones. Rec/trans set is around $60 -75 with addl sensors around $35 ea.
Last edited by Garycw; August 2, 2013 at 06:26 AM.