the smaller set of dip switches (on the right hand side as shown) the second switch says "US ONLY" for the lower selection & "US / CAN " for the upper selection...plain & simple.
PS...If you should
EVER unplug this style of electronic coin acceptor/slug rejector ( also called a "flight-deck" by some) on these 'mechs or a MARS 'mech with the power still applied to the coinmech proper, it will
TOTALLY screw up the programing of the unit. and then you will be doing this.