Synology RS815+ RackStation 4-Bay (Diskless) Network Attached Storage (NAS) Port RJ-45: 4 x 10/100/1000M Port USB: 2 x USB3.0 Port eSATA: 1 x eSATA Form Factor: 4-Bay Processor: Intel Atom C2538 Quad Core 2.4GHz Supported Protocols: CIFS, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP) Power: AC Input Power Voltage: 100V to 240V Power Frequency: 50 Hz to 60 Hz, Single Phase Temperature: Operating Temperature: 5 degree C to 35 degree C (40 degree F to 95 degree F) Storage Temperature: -20 degree C to 60 degree C (-5 degree F to 140 degree F)