This is a 1 in 3 out high definition video signal convertor, it converts TVI AHD CVI signal to HD/VGA/CVBS signal. The convertor recognizes input video signal automatically and is compatible with 1080P and 720P signal input. The output HD signal supports 1080P and 720P. To use, connect the converter to a power adapter, then connect the video signal input and output. Press the button to shift between different signal types and resolutions.