modulating a low power low frequency signal with the personal identification data a personal area network receiver for receiving the modulated signal a database for storing purchasing data for a plurality of customers a memory including instructions which when executed associate the received personal identification data with the stored shopping data for one of the plurality of customers and a microprocessor for executing the stored instructions application_number US 11231802 A description a computer system incorporating the principles of the present invention is shown in fig1 system 10 includes a personal access network pan device such as a wearable computer 14 a personal area network receiver 18 and a server 20 system 10 may also a computer station 24 that may be a checkout terminal or the like wearable computer 14 is comprised of a low power transmitter low frequency transmitter that is powered by the human body salinity device 14 generates an external electric field that is transmitted by the human body brought in close proximity or contact with pan receiver 18 device 14 is shown in more detail in fig2 device 14 is powered by an internal power source 30 such as a watch battery or the like power source 30 is coupled to an oscillator 32 to generate an electrical potential between electrode 34 and a virtual.