4 HDMI Inputs: The V-1HD has 4 HDMI input connectors compatible with a variety of equipment. The V-1HD supports 1080p/1080i/720p video resolutions. Devices outputting the same resolution can be input regardless of what type of device they are. Both progressive and interlace signals can be input allowing for both 1080i and 1080p signals to be used at the same time. | Professional Switching: The V-1HD has large back-lit buttons for intuitive video switching even in low light conditions. The V-1HD even lets you know which inputs have sources connected by illuminating the buttons of the inputs with connected sources. The V-1HD features broadcast style Preview/Program switching for professional results. | Effects: Compositing two videos in one screen using Picture in Picture or the split function is ideal for seminars and presentations. The V-1HD also supports chroma key and luminance key which ideal for creating professional looking broadcasts using green screen backgrounds or for overlaying computer generated titles on top of video sources. | Audio Mixing: Included is a 12 channel digital audio mixer. The V-1HD can mix 4 stereo audio inputs from the HDMI ports, the stereo line level input and a mic level input. Every channel is equipped with a delay function to synchronize the video and the audio. Audio follow function enables the audio to transition along with the video. | Menu and Settings: The on-screen menu display appears on the preview screen and is easy to operate with hardware controls. Making adjustments to parameters and operating the audio mixer can be made by simple operation of the buttons and the T-Fader on the unit.