HamiltonBuhl Schoolmate&trade; Deluxe Headset with Gooseneck Microphone Omnidirectional Headband: Adjustable, Vinyl Covered Ear Cushions: Replaceable Leatherette 40mm Speaker Drivers Frequency Response: 50-20,000 Hz Impedance: 32 Sensitivity: 105dB4dB Plugs: 3.5mm Stereo Jacketed Cord: 5&#039; Dura-Cord - chew-resistant, PVC-jacketed, braided nylon Prop 65 Compliant Omnidirectional Sensitivity: -423dB Frequency Response: 50-16,000 Hz Impedance: 2,200 Plug: 3.5mm TRRS