OREI HD-401P 4 X 1 High Speed HDMI Switcher With Remote - Supports 3D 1080P/4K with Picture in Picture, Simply plug in the HDMI input sources into the input connections and the output connection to your TV or projector. Switch to the input source you want using the remote or using the select button on the switch. The HDMI signal from the selected input is passed through to the output HDMI connection.