laptop - Thinkpad T450s WWAN M.2 slot - M or B key? - Super User
Dual Band Wireless-AC 7260 NGFF M2 Use for Intel AC 7260NGW 802.11ac 2x2 Wi-Fi + Bluetooth 4.0 Compatible with Lenovo Thinkpad T440 T540 X240 W540 L540 L440 Fru: 04X6007
How to Install an M.2 SSD in the Lenovo ThinkPad T440s | Laptop Mag