Improved fit and Active Noise Cancellation To ensure you get the best possible fit, you're given the choice of 3 sizes - small, medium and large - of tips that easily clip onto the stems. These in-ear tapered silicone tips conform to your ear shape to create a more secure fit that helps to deliver improved Active Noise Cancellation. The outward-facing microphone works to detect external sound, which is then countered with an equal anti-noise to cancel it out. Need to hear what's happening around you? No problem, thanks to the Transparency mode, which allows you to talk to the people around you without distraction. Just press the Force sensor on the stem of the AirPods Pro to switch from Active Noise Cancellation to Transparency mode. The Force sensor also lets you control music and calls for quick reaction.