Epson EH-LS650W User Manual page 22

Installing Batteries in the Remote Control
It is recommended that you aim the remote control at the projector's receivers
within the distance and angles listed here.
The projector may not respond to commands if you use the remote
control in conditions with bright fluorescent lights or in direct
sunlight. If you are not going to use the remote control for a long time,
a
remove the batteries.
22