DS718+

2-bay DiskStation (up to 7-bay), Quad Core 1.5 GHz (turbo to 2.3 GHz), 2GB RAM (up to 6GB)
•  CPU: Intel J3455 Quad Core 1.5 GHz
•  Memory: 2 GB DDR3L
•  Internal HDD/SSD:  3.5" SATA HDD or 2.5" SATA HDD,  or 2.5" SATA SSD
•  Max Internal Capacity: 24 TB (12 TB drive x 4)
•  Maximum Capacity with Expansion Units: 84 TB (12 TB drive x 7)
•  External Ports: USB 3.0 x 2,  eSATA Port x 1
•  LAN: RJ-45 1GbE LAN Port x 2
•  Maximum IP cam: 40