Tech-wise, the Momentum headphones have three active noise-cancelling modes—max, anti-wind, and anti-pressure—that help phase out unwanted outside noise. The controls are accessible on the right ear pad, with buttons to adjust the volume, answer phone calls, and access Siri or Google Assistant. A transparent hearing mode uses the headphones’ external microphones to deliver surround sound, so you don’t need to take off your headphones when someone’s asking you a question. These same microphones also deliver audio on phone calls. Within Sennheiser’s Smart Control app you can adjust the ANC modes, toggle transparent hearing on and off, and use the visual equalizer.