Yep, only one. I’m not a Tech diver, by any means. Though I am considering going back for a 1st stage, also. Just don’t have enough info on the 1st stages. Haven’t seen the Classic with the 1st stage on sale. At $179 for the set, just about everywhere, I could pick one of those up anytime, and have another 2nd stage, too. Right now, wondering if the swivel is worth the extra $30. Really like how compact the D2 is, and it’s on sale for $129 at DRIS.