p . u . r . s . e . is the idea of a keychain attachable , small device that electronically stores and wirelessly transmits sales / returns receipts , coupons , and membership card number information . the wireless transmission of data occurs between p . u . r . s . e . and a merchant &# 39 ; s computer receiver . the device is also capable of being plugged into a computer for the purpose of viewing / managing of contents by the owner .