If
you connected your computer to a Computer or HDMI port on the projector, you also need to
connect the USB cable so you can use the pens with your
computer.
Connecting the USB cable also lets you set up the
remote control to act as a wireless mouse, but you cannot use this
feature at the same time you are using the pens with your
computer.
If you
want to use the remote control as a wireless mouse, you need to
change the
USB Type B setting in
the projector's Extended menu. You may also need to configure your
computer to work with an external USB mouse. See your computer
documentation for details.