Plantronics Audio 310

These headphones with a telescopic microphone can be adjusted according to your needs. The microphone features noise cancellation for excellent speech recognition. The headphones are suitable for internet telephone and all VoIP applications.
Specifications:
Handset:
Frequency response: 20 Hz - 20 kHz
Impedance: 32 Ohm
Microphone:
Frequency response: 100 Hz - 8 kHz
Sensitivity: -39 db
Impedance: 2000 Ohm
Interface:
2 x 3.5mm jack for PC/Laptop
Length of cable:
2.9m