Yealink Uh36 Duo Midlevel USB Headset Duo (YEA-UH36-DUO) - Headset Cable Length: 1.2 M (From Headset To 3.5 Mm Jack), USB Cable Length: 0.9 M (From Call Control Unit To USB Plug), Microphone Frequency Response Range: 100 Hz-8 Khz, Speaker Frequency Response Range: 20 Hz-20 Khz, Speaker Impedance: 32+/-4.8Ω, @ 1.0 Khz, Easy Call Management: Answer/End/Reject A Call, Volume Up/Down, USB-A Connectivity To Yealink IP Phones, USB And 3.5 Mm Connectivity To PC And Smart Device