Promise Technology SmartStor NS4300N. Total storage capacity: 4000 GB, Hard drive capacity: 0 GB, RAID levels: 0, 1, 5, 10. Compliance industry standards: IEEE802.3/IEEE802.3u/IEEE802.3ab, Data transfer rate (max): 1000 Mbit/s. Management protocols: HTTP,HTTPS, NTP, SMTP; E-mail. Weight: 2.5 kg. Operating relative humidity range: 10 - 85 %, Operating temperature range (T-T): 5 - 35 °C