Feature: 1. Single Pointing Microphone: Super cardioid single pointing microphone to reduce background noise and make pickups clearer. 2. Powerful Sound: Using sophisticated production technology and 40mm speakers, the headset has a powerful sound. 3. Wide Compatibility: With a wide range of compatibility, the headset supports for Win XP Vista 7 8 10, for OS X, etc. 4. Sound Card Chip: Built in sound card chip to make the sound clear, has excellent performance, and has a long service life. 5. Anti Electromagnetic Interference: The phone headset adopts shielded wires, which is anti electromagnetic interference, strong and durable. How to Use: Plug and play Specification: Item Type: Telephone Headset Material: ABS, PU Microphone: Microphone Size: Ф Approx. 6.0mm / 0.24in, Approx. 5.0mm / 0.20in Directionality: Single Point Sensitivity: -47±3dB Impedance: ≤2.2KΩ Straw Length: Approx. 17cm / 6.7in Speaker: Diameter: Ø Approx. 40mm / 1.6in Impedance: 32Ω Frequency Response: 20Hz to 20kHz Output Sound Pressure (S.P.L): ≤98dB Plug Type: USB+3.5 Four Level Single Plug Package List: 1 x Telephone Headset 1 x User Manual 1 x Pullable Straw 1 x USB Sound Card