They are KR808D-1's. They have several different kinds of cartos - the WOW cartos are the hottest, probably a little lower resistance. The XL
batteries last the longest - a moderate vaper could likely get 6-8 hours out of one. They're a good outfit and are what got me off of cigarettes in the first place. If you sign up for their friends and family program, you'll get e-mails with significant discounts regularly.
That said, I would probably recommend a 510-based unit for your wife, just to make things easily interchangeable with your REO (assuming you don't have one of the 801 woodies).