A4Tech Foldable iChat Headset HS-105

Driver Units: 30 mm
Frequency Response: 20 Hz ~ 20 kHz
Impedance: 32 ohms
Microphone Sensitivity: -58db±db
Sound Pressure(1khz/0db): 94dB±3dB
Cord & Strap Length: 2 meters
Input Plug: 3.5 mm stereo