The physical characteristics of these cards are their weight, 0.07 ounces, their size, one sixth of a credit card (32 mm x 24 mm x 2.1 mm) particularly lends them to communicating Mobile markets: Personal assistants/PDA, MP3 drivers, Mobile phones, also to Digital equipment such as cameras and others. Their rate of data-transfer varies between 2 and 4 MB per second.