Casio IT-2000D - Manual (Page 27)

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Note:
Hold down the Power switch for more than one second until the power is off. This is done to
prevent the power from accidentally being turned off by the user. In addition, key input will not
be enabled for approximately one second after the Power switch has been pressed.
This occurs because the monitoring timer starts operating the moment the Power switch is
pressed and does not allow key input for about one second until this timer expires.
After this interval, key input becomes possible.