Nanosonics Trophon™ High-Level Disinfection method has been qualified for use on the E9-4 Transducer running software version 4.7.323L or higher on the z.one ultra Ultrasound System and all software versions on the ZS3 Ultrasound System. Running software versions prior to 4.7.323L on the z.one ultra after using the Trophon™ EPR disinfection system can result in acoustic output levels exceeding FDA limits. Note: The software version on the z.one ultra can be verified by pressing the service key.