Amazon.com: Lenovo ThinkPad T440 14inch Business Laptop Computer, Intel Core i5-4300U Up to 2.9GHz, 8GB RAM, 256GB SSD, Bluetooth, USB 3.0, Windows 10 Professional (Renewed) : Electronics
Lenovo ThinkPad T440s Ultrabook Review: The Ultimate Business Ultraportable? - PC Perspective
Lenovo Thinkpad T440S Troubleshooting - iFixit
Fully Working Thinkpad T440 Running Big Sur 11.1 and OC 0.6.6 : r/hackintosh