The Sennheiser SC 635 Mono USB and 3.5mm Corded headset aka 'The Century' is Sennheiser's premium USB (for computer) and 3.5mm (for mobile/tablet connections) ultra noise cancelling (UNC) mono headset. It's designed to be used with Computer, tablet and mobile phone that use a USB and 3.5mm jack . The SC635 headset has an over the head wearing style, with rotatable microphone for left or right hand side wear. Features – Natural listening experience- With Sennheiser Voice Clarity Perfect speech output - Ultra noise-cancelling microphone Outstanding sound quality - High-quality neodymium speaker High-quality durable design - Brushed aluminum and stainless steel components Exceptional wearing comfort - Large leatherette ear pads for all day comfort and powerful sound Personal fit - Extension headband with number indications for accurate adjustment Brushed aluminum parts for strong and lightweight design