The 4x1 HDMI Switcher supports PIP,4K and 3D can do connect four HD Sources to one HD Display. It can easily switch any one of the input four HD Sources to one HD display. It supports PIP function, and it can do switch or choose the input sources by checking the small picture window from the PIP. Input: 4 HDMI A-Type Output: 1 HDMI A-Type+1SPDIF+L/R Support: CEC 4K*2K 3D Support HDMI1.4b