1. Make : intel
2. Model : NUC8i3
3. RAM : 16GB
4. SSD : 256GB (m.2)
5. SSD slot 2 : 1x SATA SSD bay ready
6. Extend kit : Extend kit cover provides extra USB & Ethernet ports
7. OS : windows 11 (8th gen i3 certified by Microsoft's Windows 11 compatibility)
8. Accessories : (1) Power Adapter (2) VESA mount bracket
9. size : 4.5" x 4.5" x 3.75"
Now 256GB m.2 SSD is installed and this also has SATA bay for the extra drive.
Please see the pictures for the details.