illustrated in fig5 b rfid tag 70 can be coupled to a card 110 of course rfid tag 70 could also be coupled to a lid or straw for a cup tag 70 is adapted to store information relating to at least one of the purchase time the purchase date the size of the cup and the amount of beverage being purchase an iso 15693 certified read write 13 56 mhz rfid tag has the ability to read through water human tissue and plastic these iso certified tags are individually numbered giving the system the ability to individually track each cup in the system the tags also have anti collision identification protocols within the iso 15693 readers allowing multiple transponder or tags to be read simultaneously in some embodiments the tags will be passive tags so the tags will not have a battery source giving the tag a very long shelf life passive rfid tag may be powered up by rfid antenna to read and write information to the tags in one embodiment tag 70 is powered up by a first antenna at a cash register and by a second rfid antenna at the dispensing system active tags which use a battery source may also be used in applications creating a larger read write field tag 70 as described in fig5 a includes 96 bits of storage however it should be understood that beverage dispensing system 2 may be used with either a high frequency hf or ultra high frequency uhf antenna reader hf antennas readers are less expensive have smaller read fields and use more costly tags uhf antennas readers are more expensive have larger read fields and use lower cost tags tags may store information including name point of initial or last sale initial or.