G25357A - (Pkg 4) PIR Long Range Fresnel Lens
Small Poly IR® Fresnel lens is about 2" x 1.7" overall with an array area of about 1.7" x 1.5". These are off white; opaque looking plastic but they pass IR energy with ease. We have no other information on these except the Part# 1.9777. Great for making or experimenting with PIR units.Sold in a package of 4.