Qnap TS-409 Pro specs

CPU - Marvell 5281 500MHz

DRAM - 256 MB DDRII

Flash Memory - 8MB

HDD - 4 * 3.5" SATA I/II

LAN Port - 1 * Gigabit RJ-45 Ethernet port

LED Indicators - Status, USB, LAN, HDD 1, HDD 2, HDD 3, HDD 4

USB - 3 * USB 2.0, support USB printer, disk, digital camera, pen drive, card reader, USB hub, and USB UPS etc.

Buttons:
USB auto-copy button
Power button
Reset button

Alarm Buzzer - System Warning

Form Factor - Tower

Dimensions - 225 (D) x176 (W)x 188 (H) mm

Weight:
Net weight: 3 kg (w/o power adaptor)
Gross weight: 4.75 kg (full package)

Temperature - 0~40°C

Humidity - 0~95% R.H.

Power Supply - Input: 100-240V AC, 50/60Hz, Output: 12V DC, 10A

Energy-saving Design - Smart fan, sleep mode: 18.8W; in operation: 44.6W

Thermal Solution - Heat dissipation by fan

Secure Design:
K-Lock security slot for theft prevention
Anti-kick power adaptor design

Sound Level: - Standby: 36.4 dB

In operation: 40.6dB