Terminal Keyboard - Ingenico iWL255 Quick Reference Manual

Press the green [Enter] key to power on the device; the terminal will
initiate an application check and then enter the idle screen. To power off
the device, press the yellow [Correction] key and the [Administrator]
button simultaneously for one second.

Terminal Keyboard

The terminal keypad contains 10 numeric keys (0-9), an up/down scroll
key, a green [Enter] key, a red [Cancel] key, a yellow [Correction] key
and a number of additional function keys. The exact number of
additional function keys varies by terminal model.
Special function keys provide customers with quick and easy access to
frequently used functions and tasks. The following special function keys
are present on the terminal: [F], [F1], [F2], [F3], [F4] and up/down
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navigator.