Specification :

This comparable coin mech It features with triple sensors and anti-string mechanism, which can protect machine from tricks and miscounting. Also allows you to choose the coin required. All you have to do is remove the plastic dummy coin from the back of the mech and replace with the coin of your choice.

Each coin inserted will be "compared" to the one you have chosen to identify a match. If the coins match, then a credit is added, if there is a difference in the coin i.e. wrong type/deformed, then the mech will reject that coin.