Interfaces: (Please follow the instructions to connect the cable in order) output: to connect the main display, HDMI1 host: to connect the host GPU, HDMI2 secondary: to connect the secondary machine GPU, Type-C: to upgrade program and inject EDID (only used during upgrades), DC 12V: power supply (default 12V 2A) Note: the host GPU cannot be directly connected to the main monitor with a DP or cable. If there is a connection, it must be unplugged. Indicators: D1: Power indicator (always on for power on), D2: function on/off indicator light, H2: HDMI2 secondary machine input signal indicator (always on: normal; off: no signal), H1: HDMI1 host input signal indicator (always on: normal; off: no signal) Button Function: Power: power switch K1: short press for switching resolution in cycle (1920 x 1080; 2560 x 1440; 3840 x 2460; 2560 x 1080; 3440 x 1440) Note: long press and hold the K1 key for 3 seconds (hold until displayed): the current resolution and refresh rate are displayed in the upper left corner of the screen, with the host information on the top and the secondary information on the bottom. K2: short press for switching the upper layer image matting intensity with a total of 21 levels from 0 to 20. (default 0, level 0 also matting) : short press to restore the upper layer cutout strength to the factory default of 0. K4: Short press for switching the function. Note: If you press the K4 key and the light on, but there are no perspective , there are two ways to solve this problem. One is to set the background color of the secondary unit to pure black; The second is to press the K2 key to enhance the RGB value. The appearance of the plug is randomly distributed and does not affect the use,don't accept the specified color. Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Voltage: AC110V Material: metal colour: black Package Contents: 1 x Host 1 plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.