FIELD: trading, in particular, monitoring quantity and quality of goods and services supply taking into account warranty service duration, rebates, preferential facilities and other commitments with respect to customer during purchase and warranty service duration. SUBSTANCE: state-of-the-art device has operation mode selection unit, goods code memory unit, message generator, sold goods code memory unit. Goal of invention is achieved by introduced service code detection unit and warranty commitment generator. EFFECT: monitoring use of goods and services during warranty service and providing rebates and compensations in infringement cases. 2 dwg
