Compliance with IEC 60318-5:2006 Part 5: 2 cm³ coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts

Compliance with ANSI S3.7:2008 American National Standard Method for Coupler Calibration of Earphones

Compliance with IEC 61094-4:1995 Part 4: Specifications for working standard microphones

Compliance with GB/T 20441.4-2006 Part 4: Specifications for working standard microphones