The Moneris Mobile 8200 handheld terminal does not have an ON/OFF switch.
To power up (or turn on) the terminal when the terminal is not on a base:
if the battery is charged, simply press the OK key
OR
place the terminal on a base (communications or charge-only base).
The green backlight comes on, the READY
screen appears and the icon appears until the terminal establishes the charge level of the battery.