So for $5 they send you a 99cent kids toy that spits out a 4 digit random code when ever the button is pushed.
How does it know its right?
They must be pre programed with a master key of such ehy, to where it can't spit out a bad code?
Even if ya pushed it a bunch of times on accident or purpose so you skipped using some codes, it don't care?
Id buy it for $5 if its dummy proof. Don't want to be denied buying something in line like a deadbeat