Get best-in-class sound quality. Built-in motion sensor and advanced microphones adapt the sound to your surroundings. Enjoy crystal clear, high-definition calls even in noisy or windy conditions. Get maximum comfort with a behind-the-ear design and flexible materials that hug your ear. Find the perfect fit by adjusting the speaker and flipping it to fit either ear. Answer calls by simply picking up the headset. When lying still, the motion sensor activates a “Power Nap” mode to save battery. Lift the headset, and it's ready to go again.