Early 2011 15 inch MacBook Pro, 2 GHZ i7, 4GB of Ram (model MC721LL/A). Machine is currently running Sierra. The Machine has been to the Apple Store this week where they have ran their diagnostics and took it in for stress testing, and it passed everything. I currently have an 256GB SSD installed where the optical drive normally lives. I have the optical drive still and will send it with the machine. If you want me to put it back in, I will, but the machine runs much better with the SSD installed. The original drive is still installed as well so this can be used as extra storage. I had the adapter replaced recently so it's in excellent condition and will be sent with the Machine. Before the Mac is posted I'll erase both drives and install Sierra again so it'll be at the setup stage when you receive it. The Mac itself is in very good condition, there are minimal scratches to the enclosure with majority found on the bottom case. The only significant cosmetic issue is the left side of the bottom case doesn't sit flush with the bottom left corner after a knock, I've attached a photo but if you want more detail of this please get in touch. Im the original owner of the Machine having it from 2011, selling it as I've bought a new one. Please note, I will only sell through eBay and am not willing to negotiate privately. If you have any questions feel free to get in touch ! Thanks