Only 1-output device should be active at all times, unless both of the two display devices have the same size and model.
This HDMI splitter cable is ideal for connecting an HDMI-compatible device (, Blueray, DVD player, P>S#3) to two visual output devices. It records a signal from a device such as a Bluray player and is routed to ON/E of two output devices attached to it.
This product can act as a signal router, for example, you can have a TV in two separate rooms, you can have a TV held in ON/E room and if you want to change the room and continue watching the TV, you just need to turn off ON/E TV and turn on the other TV. And then the signal is forwarded to the TV in the other room.