Boom mic length (mm): 130 mm, Impedance: 32 ohms, Button user controls: Call answer/ignore/end/hold; Redial; Mute; Volume +/-, Microphone type: Omnidirectional, Boom mic rotation: 270°, Ear cushions: Artificial leather (surface material), Minimum System Requirements: USB Type-A port, Warranty: 02 Years, 77R24A6.