QNAP VS-4112U-RP-PRO+US 4 Bay 1U 12 Channel Redundant Power NVR Ports: 2 x Gigabit RJ-45 Ethernet port 2 x USB 3.0 port (Back: 2) 3x USB 2.0 port (Front: 1; Back: 2) RS-232 interface *1(reserved) , RS-485*1 interface (reserved) Video Output: 1 x HDMI Processor: Dual-core Intel processor Memory: 4GB RAM Power Supply: Input: 100-240V AC, 50/60Hz, Output: 250W Temperature: Operation Temperature 0~40 Degree C/ 32~104 Dedree F Humidity: 5~95% RH non-condensing Dimensions: 1.73 x 16.97 x 19.65 (H x W x D)