Tyco Electronics ELO TOUCHSYSTEMS TOUCHCOMPUTER 1520 - Manual (Page 17)

Elo TouchSystems 1520 User Guide 17
Power Control
Power Button
The power button function can be set by the operating system under:
Control Panel->Display Properties->Screen Saver->Power->Advanced->Power
Buttons.
To override all Operating System settings and shut down the Touchcomputer, press
and hold the power button for 4-5 seconds.
Note: On select models the delay to override the operating system is extended to
15 seconds.