Epson EB-W75 User Manual page 25

Installing Batteries in the Remote Control
Make sure that you aim the remote control at the projector's receivers within
the distance and angles listed here.
Avoid using the remote control in conditions with bright fluorescent
lights or in direct sunlight, or the projector may not respond to
commands. If you are not going to use the remote control for a long
a
time, remove the batteries.
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