Epson EMP-713 Owner's Manual page 34

Connecting the Mouse Cables
If you want to use the remote control as a mouse, you need to
connect the USB mouse cable.
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Note: The USB mouse port on the projector can only be used by
connecting a USB mouse. It is not possible to connect other USB
equipment for use.
Refer to this illustration while following the steps below.
USB mouse cable
1. Connect one end of the projector's USB mouse cable to
the USB Mouse port on the projector.
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