Specification: The 4K 2X2 video wall controller, support 1-way HDMI or DVI input and 4 HDMI output, the main function is to divide a complete HDMI, DVI HD image singal into 4 blocks and assign to 4 video display unit (such as rear projection unit, LCD TV, etc.) Complete with 4 HDMI high-definition video display units to form a large dynamic image screen Product weight:209g Shell material: high quality aluminum alloy Color: Black Appearance size:170*68*24mm DC5V / 2A power supply Supports remote control Supports RS232 Output support 1920x1080P 60HZ One 3.5mm stereo output Supports 5.1CH audio output over optical fibers Support four HDMI output Support 2X2 stitching, easy operation, plug and play Supports one DVI input or HDMI input Input support HDMI1.4, HDCP1.4 Input format: RGB/YUV24bit Output format: RGB444 24bit Packing List: HDMI DVI video wall controller X1 Remote control X1(no battery) USB power cable X1 USB power adapter X1. Note: 1. The 4K refers to the HDMI inputs signal only.It supports up to 4K 30Hz in and 1080P 60Hz out. 2. Pls use qualified HDMI cable with all 19 pines wired and shielded to pair the source and display. Most sync issues are caused by poor cables. 3. For a pleasant video experience, pls use Professional Video Walls. 4. 180° rotatation only works under 2X2 mode and 1080P resolutions. 5. It supports PCM 2CH stereo audio only either from Aux or the Digital toslink port.And under some cases, when the input is 4K 30Hz, there might be no audio. Pls set the resolutions to 1080P.