It is a 30 mm red dot, 11 position adjustable, matte black finish, made in japan, $129. From what I can see, the workmanship is flawless. It included a lifetime warranty. Also included a nifty two-piece adjustable polarizing filter, which I would say is worth about $20 just by itself. It would be very good for cutting down glare from the snow on late-season hunts. Field of view seems maybe a little narrow, but probably no narrower than any other 30mm red dot. Overall a great value I would say.
I believe a 30MM on a xbow would be fine,, I have a 30 on my xbow (cant use it yet)....I also have a 42MM on my vertbow, they both work fine, both single dots
My red dot sight arrived yesterday!