The earphones are optimally designed to provide high-sensitivity, low-distortion and a wide, smooth frequency response.Perfect for province, city CDC,city physical examination center, ENT department in hospital, deaf training school,driving school,hearing clinic,hearing aid speciality store, etc.Why not have a look?Features:It's intelligently and ergonomically designed, easy to use.The earphones are optimally designed to provide high-sensitivity, low-distortion and a wide, smooth frequency response.Suitable for all imported audiometer, providing high-sensitivity.Perfect for province, city CDC,city physical examination center, ENT department in hospital, deaf training school,driving school,hearing clinic,hearing aid speciality store, etc.Hands-off screening gives the operator complete control of testing procedure.With microprocessor control, result in accurate, consistent hearing tests.Unique instrument advances pure tone air conduction threshold and screening tests for hearing.Specification:Item Type: Headphone for AudiometerMaterial: Plastic + Composite Cloth + Alloy Plug Type: AIPUTEDC:10 Ohm ±1.0 OhmPower: 100-8000HzInput/Output: 1000 mWPlug Diameter: 6.5mm /0.25inchEarmuffs Diamater: 7cm /2.75inchSensitivity: 3dBDistortion Rate: 3%Color: BlackFrequency: 125-8000HZPackage Weight: 516g/18.2ozFunction: Use for audiometer air conduction testing and screeningPackage List:1 x Headphone.1 x User Manual