Key Features: Cable terminates in GN QD connector Compatible with soft clients and normal phones e.g. Yealink, Polycom, SNOM, Cisco, Grandstream, Fanvil, Avaya, Unify, Mitel. Requires RG09 or USB bottom cable to QD - NOT INCLUDED WITH HEADSET Optimised for VoIP and Unified Communications Big and soft Leatherette ear cushions, foam option in box Excellent Noise Cancelling Microphone Wideband audio ensures a more natural voice Technical Specification: · Receiving Type: Dynamic moving coil · Connection type: Quick Disconnect · Microphone Type: ECM · Microphone Directivity: Cardioid · Wearing Style: Adjustable headband · Microphone Boom: 300° adjustable · Storage Temperature: -40?~70? · Frequency: 150~6.8kHz · Speaker Impedance (Duo): 75?±15% · Speaker Sensitivity@ 1kHz (Duo): 95±3dB · Microphone Sensitivity @ 1kHz: -41±3 dB What's in the box Headset, 2 x Spare foam ear cushion, User guide, Clothing clip