Microphone Electret Condenser Microphone The color is black Impedance 32 Ohm Microphone sensitivity F=1kHz, Pin=1Pa, 0dB=1V/Pa, Min=-48dB, Max=-44dB Headphone sensitivity 93.6dB SPL @1kHz Type of conclusion wired, USB Minimum reproducible frequency 150 Hz The material of the ear cushion is foam rubber Diameter of the membrane 28 mm Cable length Control cable: 95cm, HS cable: 120cm Type of headphones overhead Appointment office Speaker noise reduction is passive NC Microphone Noise reduction Number of speakers 2 Certificates Regulatory Approvals: CE, FCC, KCC, RCM, UL, Industrial Certifi cations: MS Lync, Avaya, Cisco Operating temperature -10 ˚C to + 50 °C