AMB transponders have their own UNIQUE ID (the PT Number).
There are basically three types of MRT transponder:
The first have either 10 or 20 preset numbers which take the place of a handout transponder (you press the button on it to get the number you need).
The second have a PT number which is 'cloned' from an AMB transponder, so it has the same number as one that you own already.
The third type have an ID (the same as a PT number). This means there is a remote possibility of a clash, though, as there are 7 numbers there are 10 to the power of 7 combinations for the numbers to take. So, 10000000 different combinations.
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