I don't see why it couldn't be previously owned. You could just create a new account for it when you plugged it into your computer and it shouldn't keep any old info it, I would think. It's just a fancy-pants pedometer but, man, is it addictive! I started off at 2,500-3,000 steps per day the first couple weeks I had it and I've worked up to 10,000-12,000 per day, 5-6 days a week now. (If I have a low day, I try and make up for it on another day so I end up at 70K for the week.) I've always exercised off/on in the past but I have stuck with this now for seven full months and I just keep doing MORE with it, vs. it tapering off, per the norm. It's like a miracle, it is. lolol