A4Tech Headset HS-28-1, 2x3.5mm Male, 2m, Black

Superior bass-driven sound
Superior sound quality, Stunning clarity and a bass impact you can feel. Built-in microphone picks up sound from any direction with remarkable clarity. Ear cushions: ergonomic and comfortable. Adjustable headband for optimum fit and long-term comfort.

Specifications
Model: HS-28
Style: On-the-Head
Product name : Stereo Headset
Frequency Response: 20Hz~20KHz
Nominal Impedance: 32ohms
Microphone Sensitivity: -58DB
Sensitivity: 105dB±3dB (at 1000Hz )
Speaker Diameter: 40mm
Earphone / Microphone Plug: 3.5mm Stereo
Controller: Volume knob on the headset