You can look it up on the product details page.
Storage
256 GB, M.2 2230, PCIe NVMe Gen4 x4, SSD
512 GB, M.2 2280, PCIe NVMe Gen4 x4, SSD
1 TB, M.2 2280, PCIe NVMe Gen4 x4, SSD
2 TB, M.2 2280, PCIe NVMe Gen4 x4, SSD
4 TB, M.2 2280, PCIe NVMe Gen4 x4, SSD
I believe there is only 1slot