This Sennheiser Adapt 135 UC headset with a 3.5mm Jack is UC optimised for maximum performance. Featuring a large on-ear, noise-dampening earpad for and all day comfort and a boom arm which folds away discreetly when not in use. With superior stereo sound, the Adapt 100 series adapts to the user whether at the workstation, around the office on a daily commute.