Qnap ts-420u nas 4bay-hs, 1u-rack, sata-3g, gbe(2), m6282-1.6, 1gb, 2yr-advance

CPU	Marvell 1.6 GHz
DRAM	1GB DDR3 RAM
Flash Memory	16MB
Hard Disk Drive	4 x 3.5" or 2.5" SATA I/II hard disk drive (HDD) NOTE: The system is shipped without hard disk drives. For the hard disk drive compatibility list, please visit http://www.qnap.com/en/?sn=3877&lang=en
Hard Disk Tray	4 x hot-swappable and lockable tray
LAN Port	2 x Gigabit RJ-45 Ethernet port
LED Indicators	USB, Status, HDD 1, HDD 2, HDD 3, HDD 4, LAN
USB	2 x USB 3.0 port, 2 x USB 2.0 port Supports USB printer, disk, 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	Rackmount
Dimensions	44(H) x 439(W) x 483(D) mm 1.73(H) x 16.97(W) x 19.02(D) inch
Weight	Net weight: 6.7 Kg (14.77 lb) Gross weight: 9.5 Kg (20.94 lb)
Power Consumption (W)	Sleep mode: 15W In operation: 29W (with 4 x 500GB HDD installed)
Temperature	0-40˚C/ 32-104F
Relative Humidity	0-95%
Power Supply	Input: 100-240V AC, 50/60Hz, Output: 250W
Fan	2 x quiet cooling fan (4 cm, 12V DC)