Logitech USB Headset Stereo H650e The double-ear, corded headset with enterprise-grade audio that people actually want to use. Ideal for employees who need to block off surrounding noise for laser-like focus during desktop calls. Comfortable, stylish and intuitive so people actually love to use them – further enhancing UC collaboration in your workplace. System Requirements Windows Vista, Windows 7 or Windows 8 (32-bit or 64-bit) Mac OS 10.7 or higher Linux Available USB port Technical Specifications Microphone Type: Bi-directional ECM Frequency response: 100 Hz - 10 KHZ Sensitivity: -45 dB +/- 3 dB Distortion: <10% @ 1kHz, 15dBPa (MRP) input Operating voltage: 1.4 - 5.0V DC Speakers Frequency response: 50 Hz - 10 kHz( Diffuse field ) Sensitivity: 90dB ±3 dB at 1KHz, Input0.56V/10mm free field Max output: <100 dB SPL (Compliant to EN60950-1) Distortion: < 4% @ 1kHz, 0dBm0, 1kHz