Califone 3066USB Deluxe Multimedia Stereo Headset, USB plug with Plug and Play performance and Android/Windows/Mac compatbility, Fully adjustable to fit all sizes The Deluxe Stereo Headset is designed for language learning in today's classrooms. This compact, adjustable headset is ideal for high speed internet listening, language learning and tutorials in computer labs and other multimedia applications as well as a web phone. Key Features Recessed wiring resists prying fingers, with rugged ABS plastic headstrap and earcups to hold up to sustained use Fully adjustable to fit all sizes Permanently attached cord with reinforced connection resists accidental pull out 7’ cord with in-line volume and mute control, mic on/off switch USB plug with Plug and Play performance and Android/Windows/Mac compatbility Flexible gooseneck with electret mic and built-in wind screen to reduce recording of unintended sounds Noise-reducing earcups lower ambient noise so volume does not need to be as high, as recommended by audiologists for hearing safety Replaceable leatherette ear cushions Slotted baffle prevents access and avoids accidental speaker puncture Specifications Speaker Diaphragm: 40mm Mylar Magnet: Ferrite Cobalt Frequency Response: 20-20,000 Hz Sensitivity: 110dB SPL ± 3dB at 1kHz Max Input: Min/Max 20/30 milliwatts R/L Output Diff: 3dB Distortion: 5% Microphone Type: Electret condensor Directivity: Omnidirectional Sensitivity: -41dB, min -38dB, max -35dB Frequency Response: 20-16,000 Hz Impedance: 1,500 Ohms ± 15% Operating Voltage: Nominal +3V; accepts 1.5V-10V Weight: 12 ounces, shipping weight 2 lbs