HF-VWC22A: 2x2 Video Wall Controller, 1080P@60HZ HD Display, 180 Degree Rotate, 8 Display Modes - 2x2, 1x2, 1x3, 1x4, 2x1, 3x1, 4x1,1 HDMI/DVI Input 4 HDMI Output with RS232 Control : CRHouse Technology Inc., Computer parts and accessories wholesale in Markham, Ontario