Epson TM-L90 User Manual page 7

Attaching Cover on the Power Switch
The enclosed power switch cover ensures that the power switch is not
pressed accidentally.
You can turn the power switch on and off by inserting a pointed object
such as a ballpoint pen in the holes in the power switch cover.
Power switch cover
WARNING:
If an accident occurs with the power switch cover attached, unplug
the power cord immediately. Continued use may cause fire or shock.
CAUTION:
Do not remove the power switch soft cover.
TM-L90 User's Manual 7