I bought this when I was writing my thesis and found it helpful. I would only use it when I was feeling tired so it's been overall minimally used. It's condition is almost like new. I still have it's original box. It works with Windows (7, 8, and others), as well as Mac (I was using it with my Retina Display).

I chose this model over others because it has a full keyboard- so any key I would need is there. Furthermore, I was going to buy a trackpad/mouse and this keyboard already had one built in.

Retail is $80, asking for $40

http://www.bestbuy.com/site/adesso-tru-form-pro-contoured-ergonomic-keyboard-black/9984267.p?id=1218205379165&skuId=9984267