1、The super cardioid single pointing microphone reduces background noise and makes the pickup clearer. Record at the pickup cues point and choose a suitable recording distance. 2、Using 30MM speakers, the sound is powerful, and the built in Hi Fi sound card chip makes the sound clearer. 3、Off type multimedia office telephone line controller, "M" is the microphone mute switch, "S" is the speaker mute switch, "+" is the volume up switch, and "‑" is the volume down switch. 4、USB 2.0 version digital chip office traffic adapter cable,which is plug and play, and no driver required. Suitable for Windows,for OS X,for Chrome OS,support calling various platforms using for SKYpe, for Google Hangouts, for FaceTime for OS X to operate. 5、Using brass shielded wire, anti electromagnetic interference, reduce signal transmission loss, light body, comfortable clamping force, freely adjustable headset size. Item Type: Computer Headset Material: ABS,Brass Microphone: Microphone Size: Approx.Ф6.0 x 5.0mm / 0.2 x 0.2in Directionality: Single Point Sensitivity: -47±3dB Impedance ≤ 2.2kΩ Straw Length: Approx. 23cm / 9.1in Trumpet: Diameter: Approx.Ø30mm / 1.2in Impedance: 32Ω Frequency Response: 20Hz to 20kHz Output Sound Pressure (S.P.L): 96dB±3dB 1 x Headset 1 x User Manual 1 x USB Transfer Chip