The SC 135 USB (single-sided) headset is a headset with a 3.5mm jack and a detachable USB-C cable, optimized for flexible UC professionals, who value great sound, discreet modern style and comfort.The SC 100 headsets make a great impression. From their contemporary sleek styling to great sound for calls and multimedia, they excel in all areas: at your workstation, on the move around the office or on your commute to work, there is a variant tailored to your needs.With discreet boom arm design, adjustable fit and a choice between acoustic foam or soft leatherette ear pads, the SC 100 headsets are built for flexibility and comfort.Included in the box:Headset, acoustic leatherette ear pad(s) mounted on headset cable/detachable call control (USB A/C), safety guide, quick guide