QNAP VS-2012-PRO-US 2-Bay NVR 12-Channel Surveillance System Processor: Dual-core Intel? Atom? processor Memory: 1GB RAM, 512MB Flash (DOM) HDD Capacity: 2 x 3.5" SATA(II)/2.5" SATA/SSD HDD Tray: 2 x hot-swappable and lockable tray LED Indicators: Status, LAN, USB, eSATA, Power, HDD 1, HDD 2 USB: 5 x USB 2.0 port (Front: 1; Back: 4) Form Factor: Tower Fan: 1 x smart fan (7 cm, 12V DC)