This is the model XR4400. This unit will provide 4 channels of full-featured gate for your PA. These are a great way to control bleed from "open" mics on stage. It's in full working order and in very clean, excellent condition. You can read reviews all over the net on this device. The bottom line is that offers a very good feature set for a good price. It sells for about $150 new. Here is a link to the MULTIGATE PRODUCT PAGE. I'm looking for $55 shipped (firm) for The gate. Check out my feedback. PM or post any comments. The first photo is a pro shot, since I find it difficult to photograph rack gear.