An apparatus comprising: (a) a housing; (b) a processing circuit contained within the housing; (c) a user feedback feature in communication with the processing circuit; (d) a surgical instrument interface feature, wherein the surgical instrument interface feature comprises: (i) a structural interface feature, wherein the structural interface feature is configured to fit in a portion of a body of a surgical instrument, wherein the portion of the body of the surgical instrument is configured to receive an ultrasonic transducer, and (ii) an electrical interface feature, wherein the electrical interface feature is in communication with the processing circuit, wherein the electrical interface feature is configured to interface with a complementary electrical interface feature of the surgical instrument, wherein the complementary electrical interface feature of the surgical instrument is configured to couple with an ultrasonic transducer; and (e) a plug port in communication with the processing circuit, wherein the plug port is configured to couple with a cable from an ultrasonic transducer of a surgical instrument; wherein the processing circuit is configured to receive data relating to a number of uses of the surgical instrument via the electrical interface feature and wherein the processing circuit is configured to receive data relating to a number of uses of the surgical instrument via the plug port; and wherein the processing circuit is further configured to drive the user feedback feature based on the data relating to a number of uses of the surgical instrument. (a) a housing; (b) a processing circuit contained within the housing; (c) a user feedback feature in communication with the processing circuit; (d) a surgical instrument interface feature, wherein the surgical instrument interface feature comprises: (i) a structural interface feature, wherein the structural interface feature is configured to fit in a portion of a body of a surgical instrument, wherein the portion of the body of the surgical instrument is configured to receive an ultrasonic transducer, and (ii) an electrical interface feature, wherein the electrical interface feature is in communication with the processing circuit, wherein the electrical interface feature is configured to interface with a complementary electrical interface feature of the surgical instrument, wherein the complementary electrical interface feature of the surgical instrument is configured to couple with an ultrasonic transducer; and (i) a structural interface feature, wherein the structural interface feature is configured to fit in a portion of a body of a surgical instrument, wherein the portion of the body of the surgical instrument is configured to receive an ultrasonic transducer, and (ii) an electrical interface feature, wherein the electrical interface feature is in communication with the processing circuit, wherein the electrical interface feature is configured to interface with a complementary electrical interface feature of the surgical instrument, wherein the complementary electrical interface feature of the surgical instrument is configured to couple with an ultrasonic transducer; and (e) a plug port in communication with the processing circuit, wherein the plug port is configured to couple with a cable from an ultrasonic transducer of a surgical instrument; wherein the processing circuit is configured to receive data relating to a number of uses of the surgical instrument via the electrical interface feature and wherein the processing circuit is configured to receive data relating to a number of uses of the surgical instrument via the plug port; and wherein the processing circuit is further configured to drive the user feedback feature based on the data relating to a number of uses of the surgical instrument.