hyjackers, what is this device, tell that first. ok?
it is POINT of SALE (POS) device,
get the manual first, in all case.
iF MACHINE SHOWS ERROR 3,CHECK WHETHER YOU ARE IN THE CORRECT MODE.PRESS CANCEL TO CLEAR THE ERROR
or ask here.
last post was 2014, this thing is old.
try a fresh battery FIRST ?
are you in Kenya, we are USA and have not SUCH thing here.