Synology DX513 Diskless System Expansion Unit for Increasing Capacity of the Synology DiskStation Form Factor: 5-Bay HDD Interface: 3.5 or 2.5 SATA(II) X 5 (hard drives not included) Power: 100-240 VAC 50/60Hz Power Consumption: 45.1W (Access), 16.5W (HDD Hibernation) Temperature: Operating Temperature: 5 to 35 degree Storage Temperature: -10 to 70 degree Humidity: 5-95% R.H Dimensions: 9.76 x 9.17 x 6.18 Weight: 8.62 lbs. Package Contents: DX513 Main Unit User's Guide Assembling Kit AC Power Cord Expansion Cable