Bplus M2P4S M.2 (NGFF) PCIe base SSD to PCIe X4 Adapter PCIe base M.2(NGFF) SSD as a HDD Card for desktop PC Design two slot for M.2(NGFF) SSD One slot use for PCIe x4 slot for desktop PC directly Do not need any software drivers Support M.2 Key M Card Type.