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. <EOS>