(SNG-NAS-DS918+) DiskStation DS918+

CPU : Intel Celeron J3455, 64 Bit, Quad Core 1.5 burst up to 2.3 GHz
nRAM :  4 GB DDR3L, Up to 8 GB (4 GB x 2), 2 Slots Memory
nDrive Bays : 4
n – Max. Bays with Expansion : 9
nDrive Type
n3.5″” SATA HDD , 2.5″” SATA HDD  ,  2.5″” SATA SSD , M.2 NVMe 2280 SSD (Optional)”
n – Max. Capacity : 40 TB (10 TB drive x 4) (Capacity may vary by RAID types)
n – Max. Capacity with Expansion: 90 TB (10 TB drive x 9) (Capacity may vary by RAID types)
nHot Swappable Drive : Yes
nPorts  
n– RJ-45 1GbE LAN : 2 (with Link Aggregation / Failover support)
n – USB 3.0  : 2
n – eSATA Port : 1
nSupported RAID Type : Synology Hybrid RAID, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10″
nMAX IP cam #  : 40 (including 2 Free License)
nVirtualization  : Vmware vSphere 6 with VAAI, Window Server 2012, Window Server 2012 R2, Citrix Ready, OpenStack