A self-powered electronic lock is provided having a housing, a lock element mounted in the housing for movement relative to the housing between a locked position and an unlocked position, a code input device operating with a first set of electronics, and an electric actuator operating with a second set of electronics. Each sensor consists of a transmitter and a receiver and operates with high-frequency waves. An artificial skin, for example, is removably attached to the artificial arm, and the material is placed over the artificial skin. As a result, each parasitic loop may be tuned to provide control over the magnitude of the electromagnetic field.