Comelit PAC D8239 153KHz ISO Proximity Card (26-bit) (909021034)The D8239 ISO proximity card is compatible with the D8201, D8201W, D8203, and D8203W and GS3 Proximity Readers. 'Credit card' thin, ISO 7813 compliant with a nominal thickness of 0. 03 in. it requires no batteries and carries a lifetime warranty. The card is supplied with its 26 bit Wiegand code on a removable label. As an alternative to the traditional mechanical key, millions of our proximity cards and fobs are used by people as an easy and reliable