Holiday Shipping Details & Extended Holiday Returns 
This HDMI/DVI video wall controller can distribute one HDMI or DVI input signal device to 4 HDMI outputs display simultaneously, via LCD splicing screens can form a complete dynamic large video wall screen and digital signage displays, bring you an amazing visual experience. It is the ideal choice for shopping mall video exhibition, video conference, security monitor and other large screen splicing display.
2x2 HDMI video image processor can connect up to 4 LCD TVs or other displays, which have up to multiple display modes for your choice, such as 2x2, 1x1, 1x2, 1x3, 1x4, 4x1, 3x1, 2x1.
The 2x2 Video Wall Controller can be controlled by remote, button and RS232.
All this modes provides variety splicing options, can easily switch the modes through the IR remote control without getting up or press the "Switch" key at the TV wall controller. Also support RS 232 advanced remote-control. (The remote need Two AAA batteries, Not include in the package)
With the 180 degree rotation function, you can flip the image of HDMI output 1 & output 2 to 180°, which can adjust the screens in an orientation with the thinnest edges, reduce the thick middle border. This is easy to adjust it, just press the "Out1 flip Out2 flip" button on the remote.
NOTE: 180°rotation can work for all the display modes, and the output resolutions NOT more than 1080P@60Hz.
Q: How to use 180 degree rotation function?
A:180°rotation can work for all the display modes, and the output resolutions NOT more than 1080P@60Hz. So please adjust the HDMI outputs' resolution to 1080P.
Q: The screens show no "signal", what should we do?
A: Please set the input source and the output displays to the same resolution 1080P have a try.
Q: What are the specifications of this HDMI DVI wall controller?
A: This 4K HDMI LED video wall controller is compliant with HDCP 1.4 and HDMI 1.4. Input format: RGB/YUV 24bit; Output format: RGB4:4:4 24bit.
Support HDMI/DVI input resolution: 3840x2160P@24/30Hz, 1920x1080P@25/30/50/60Hz; Output resolution: 1920x1080P@60Hz.
Support audio format: PCM 2.0, Dobly digital and DTS.