Note: The host graphics card can no longer be connected to the DP cable or directly connected to the main monitor, if connected, to be dialed off.Colour:BlackMaterial:MetalIf there are slight differences in the appearance pictures, it will not affect the use of the product.Indicator light:[D1]: Power light (will light up when power is on)[D2]: function on/off indicator (long bright function on, not bright function off)[H2]: HDMI2 input signal light (long light normal, not light that no signal over)[H1]: HDMI1 host input signal lamp (long light normal, does not light means no signal over)Button function:[Power]: power switch[K1]: short press: cycle switching resolution, 1920*1080,2560*1440,3840*2160,2560*1080,3440*1440.Long press the [K1] key for three seconds (hold it down until it is displayed): the top left corner of the screen displays the current resolution and refresh rate, the upper host information, the lower information[K2]: short press: switch the upper keying intensity, 0-20 levels of a total of 21 gears, the factory default 0 (0 also keying).[]: Short press: Restore the upper keying intensity to the factory default 0.[K4]: Short press: Turn on/off the function.Note: Long press the [K4] key for two seconds to enter the single screen of the . To exit, you must also press and hold the [K4] key for two seconds.Press the [K4] the DMA box D2 light is on, but no perspective , Countermeasures: 1, please set the background of the secondary camera to pure black; 2, press the [K2] key to enhance the RGB value.Package Contents:1 x DMA Video Overlay Box1 x DP Cable2 xOnly 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.