CPU Intel® Atom™ Dual-core Processor DRAM 1GB DDRII RAM Flash Memory 512MB DOM HDD 2.5/ 3.5" SATA I/II HDD x4 NOTE: The system is shipped without HDD. For the HDD compatibility list, please visit http://www.qnap.com/pro_compatibility.asp HDD Tray 4 x Hot-swappable and lockable tray LAN Port 2 x Gigabit RJ-45 Ethernet port LED Indicators Status, LAN, USB, HDD 1, HDD 2, HDD 3, HDD 4 USB 5 x USB 2.0 port (Front: 1; Back: 4) Support USB printer, pen drive, USB hub, and USB UPS etc. eSATA 2 x eSATA port (Back) Buttons System: Power button, USB One-Touch-Backup Button, Reset button Alarm Buzzer System warning Form Factor 1U rackmount Dimensions 44(H) x 439(W) x 499(D) mm 1.73(H) x 16.97(W) x 19.65(D) inch Weight Net weight: 7.63 kg/ 16.82 lb Gross weight: 12.1 kg/ 26.68 lb Power Consumption (W) Sleep mode: 40W In Operation: 62W Power-off (in WOL mode): 3W (with 4 x 500GB HDD installed) Temperature 0~40˚C Humidity 0~95% R.H. Power Supply Input: 100-240 Vac~, 50-60Hz, 2A, Output: 150W VGA Reserved VGA interface for maintenance Fan 3 x cooling fan (4 cm, 12V DC; internal )