Overview the el 21sy switcher accepts two hdmi inputs and allows the user to switch between two input sources to provide a single hdmi output for connection to the hdmi display this switcher has an auto detect function which will switch the unit when a source which is powered lsquoonrsquo alternatively the input can be selected manually using the input selection button on the device specification v13 hdmi hdcp 11 and dvi 10 compliant hdmi 2 way switcher resolutions supported pc