Hybrid 3 layer Active Noise Cancellation with Active Noise Cancellation. 1. An outward-facing microphone detects external noises and counters them with equivalent anti-noise to lower ambient noise by up to 35 decibels. 2. An inward-facing microphone listens within the ear canal for internal noises before producing anti-noise to cancel the left noise twice. 3. Ear caps exclude 90% of noise from entering the ear canal.Transparency Mode allows you to hear what you want while also allowing you to hear and interact with the environment around you. Without taking off the headphones, you can plainly hear the aircraft or subway announcements as well as what is going on around you. Optical Sensors Technology: They detect when they’re in your ears and pause when you pull them out using optical sensors technology. Adopt a high-precision contact sensor that is tailored for everyday usage and sporting events, allowing for real-time measurement of wear condition.Pick up the two headsets from the charging case, and they’ll instantly pair. Then, to link the gadget with your headphones, just activate bluetooth connection on your phone. On the go charging The TOZO NC2 wireless earbuds can be used for over 8 hours on a single charge and can be charged for an additional 32 hours in the small charging case. Providing an easy way to charge with no strings attached. IPX6 Waterproofing protects against perspiration and raindrop splash damage.