The most compact thinkpad of its era, with specs that still hold up today! Excellent battery life. - 8gb RAM / 256gb SSD - 4th gen Intel i7 - 1366x768 IPS display - IPS panels look much better than their counterparts - 2x USB, 3.5mm, Ethernet, SD card and SIM card slots, VGA and Displayport but no HDMI - THREE batteries - one internal, and two external to choose from. Most of the runtime comes from the new extended capacity battery which has about a year's worth of use. - It's a thinkpad. It's durable, splash proof, repairable and has a great keyboard. Operating system (OS): I'll do a clean, activated install of Windows 10 for free or leave it as-is so you can install the Linux distro of your choice. Let me know what OS you'd like and feel free to ask any questions about the machine :)