2) Counting
In power on state, press the SCAN key(2) enter counting status (The HB-22 will return to power on state after 8 seconds without further operation), place the HB-22 on the cards tightly, keep the sensors out of cards and uniform speed sliding, make the two sensors passing the cards completely. If done right, a "tick" sound will be heard and a number will be shown, otherwise, twice "tick" and the error message shown, the user needs to operate again.