Earbuds wireless bluetooth noise cancelling Ear caps prevent 90percent noise going to ear canal. Outward facing microphone detects external sounds and counter with equal anti noise to first cancel noise.Inward facing microphone listens inside ear canal to pick up internal sounds and produce anti noise again to twice cancel the left noise. Noise canceling earbuds wireless With the transparency mode, you can clearly hear the announcement of the airline or subway and what is saying around you without taking off the wireless noise cancelling earbuds. You can hear what you want to hear, which lets outside sound in so you can hear and interact with the world around you Active noise cancelling earbuds.