Features 1??This product is suitable for all audiometer types of air conductivity detection and testing. 2??Stable listening frequency is stable, high sensitivity the test result is accurate. 3??Ergonomic designs, comfortable to wear, easy and convenient to use. 4??Suitable for provincial CDC (Centers for Disease Control), municipal physical examination centers, otolaryngology departments in major and small hospitals, training schools for deaf children, driving schools, hearing clinics, hearing aid stores, etc. 5??Designed to provide high?sensitivity, low?distortion and a wide, smoothly frequency response. Specification Condition: Item Type: Audiometer Headphone Material: Plastic + Metal Earphone Type: Headphone Insert Plug Type: straight type Purpose: Audiometer air conductivity detection and screening Impedance (DC) : 10 Ohm ??1.0 Ohm Continuous Rated Power: 1000mW(milliwatt) at any frequency from 100 to 8000Hz Input/Output Linearity: 1000 mW(milliwatt) ?? 1 dB at input Plug Diameter: Approx. 6.5mm / 0.3in Sensitivity: 3dB Distortion Rate: 3% Color: Black Audiometry Frequency: 125-8000Hz This product has been thoroughly tested/inspected from the factory and found to have complete function, please feel free to purchase. Main Customer Groups: Provincial CDC (Centers for Disease Control), municipal physical examination centers, otolaryngology departments in major and small hospitals, training schools for deaf children, driving schools, hearing clinics, hearing aid stores, etc. Package List 1 x Audiometer Headphone