Key Features: Headset cable ends in USB connector. Mute-button and volume control on the cord. Compatible with soft clients on laptops and PCs, e.g. 3CX, Unify, Mitel, Avaya 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 Padded T-Bar So light weight, you can wear it all day Technical Specification: Receiving Type: Dynamic moving coil Connection type: USB Microphone Type: ECM Microphone Directivity: Cardioid Wearing Style: Adjustable headband Microphone Boom: 300 degrees adjustable Joint of speaker and headband: 20 degrees rotatable Storage Temperature: -40 Degrees Celsius -70 Degrees Celsius Frequency: 1500-6.8kHz Microphone Sensitivity at 1kHz: -41dB ±3 dB What's in the box Headset, Spare foam ear cushions, User guide, Clothing clip