1Suitable for deaf schools, private clinics, outpatient department, etc. 2High sensitivity, stable detection frequency, accurate audiometry results. 3The matching audiometer included AD226 clinical diagnostic audiometer,ITERA diagnostic audiometer,GSI audiometer, XETA audiometer,Madsen622 audiometer, etc. 4Used for audiometer bone conduction test and screening. 5Universal bone-guided audiometric earphone, suitable for all types of audiometer air conductivity detection and screening.