E-currency ID provides a highly secure, single-usage virtual card that can be used for purchase on the Internet, while maintaining user privacy, security and control. The scanner is designed to scan a plurality of incremental markings along the incremental scale, wherein the incremental markings can be scanned as an essentially analog signal progression. The terminals are disposed in the receiving holes. An authorized electrical receptacle has a receptacle surface with first and second receptacle edges, left and right side receptacle edges, and left and right slots extending inwardly.