MTT 1531/1581 General Information 

To Power the MTT On/Off

Press and hold down the Cancel/Power key for at least 1 second.

MTT Navigation

Press the up and down control keys to highlight the desired menu item.
Press the left or right control keys to operate the corresponding function.

Cancel an Operation or Exit to the Previous Screen

Select the Cancel function or press the Cancel/Power key.
(The exceptions are exiting from the Transactions and Print menus).