OD green, the pic makes it look like a lighter shade of green than it is. This is a Russian made, Gen 1+ night vision optic as marketed by Yukon as the "Mini Ospery". Works great, takes AA batteries, includes box, case, instructions, and all the trimmings-- remote on/off switch, adapter for a 35mm SLR camera, and built-in IR illuminator. This is the "tactical" model with a picatinny rail mounted on top, as you can see in the pic.
Retails for $589 plus shipping most places, one vendor I found threw in shipping for free. I'm going $525 shipped on it.