Used, in very good working condition, ready to use, Lenovo ThinkPad T520 Type 4239-46U, with 4Gb ram, 250Gbhard drive, 15" screen, preloaded with the newest Linux Mint22.2. Computer shows signs of external wear (considering how many years was in service) but all components are fully functional, display is in pretty good condition. More wear you can find on touchpad. Also TrackPoint red button in the middle of keyboard is missing. Computer originally was preloaded with Lenovo version of Windows 7 Pro, COA still attached to computer. It works very well with variety of Linux distributions and Windows 10 Pro (what I've tested) I did not test it with Windows 11. More pictures on request.
Lenovo original power supply 65W/20V is included. 
Battery is included (already hit the end of useful life).
Extra replaceable bay for second hard drive (in the place of CD drive) is included.

Ask for more pictures if needed. Also look at screenshots showing computer's configuration:
There is a list of hardware of computer T520 I'm selling. Read it carefully and ask any question before bidding:

CPU IntelCore i5-2520M 2.50GHz
RAM 4Gb (max 8Gb)
hard drive 250Gb
Docking station connector
SIM card slot
Bluetooth
Display 1366x768
Audio Intel
Ethernet Gigabit RJ45 port
WiFi Intel Centrino-N-6250 dual band 2.4GHz and 5GHz
CD/DVD drive GT50N Multi III
web cam
microphone
fingerprint reader
DP monitor port
VGA monitor port
3x USB2.0 ports
eSATA port (compatible with USB)
FireWire port 1394
Switch WiFi manually on/off
Expansion card slot
Memory card slot
Audio 3.5mm port

Computer also works with Lenovo docking stations model 4337 and 4338. Because of its high performance, computer is a perfect choice for setting it as a email, file, VPN etc, etc, powerful server and, of course, for every day computing. Computer would hit its top performance when hard drive will be replaced with  SSD and expanding memory to 8Gb (recommended if you want to run Windows 64-bit).