Epson 54c - Manual (Page 40)

40 Using the Remote Control
Removing the Battery Tape
Before using the remote control, pull out the tape from the battery
tray as shown below.
When the battery power runs low, you can replace it as described on
page 44.
Storing the Remote Control
Most of the projector’s features can be accessed only with the remote
control. To prevent losing it, store it in the projector’s remote control
storage compartment when you are not using it.
Tape
Open the door to the
remote control tray
Then place the remote
inside and close the door