El otro es un botón deslizante o slider, el cual te permite quitar la cancelación de ruido, ponerla a la mitad (O modificar a tu gusto desde la app de Sennheiser), o poner la cancelación al máximo. I swapped between speaker/headset to ensure it wasnt an actual audio/streaming issue, but only had problems when outputting to the headset. Im so happy with this speaker. two cables provided, with aftermarket cables easily found. Do NOT apply the shoe goo indoors! Ive marked them down for comfort as theyve yet to loosen up the clamping force against my ears - which for me is a little tight. No need for expensive USB interfaces. They made well, light weight, evidently comfortable & easy to run & play in. Inserted in this is a filter that adjusts the character of the sound. I saw someone suggest wearing a lot of band aids, that will definitely be necessary.