Professional Active Noise Cancelling (ANC) Technology. Developed using advanced noise canceling technology, the Wireless Headphones effectively blocks out surrounding noises, such as airplane cabin noise, city traffic or a busy office, so you can enjoy listening to music or comfortably watch movies and TV shows .Perfect for using on an airplane, train in the gym or any noisy environment Much Better Sound. Proprietary 40mm large-aperture drivers provide you with deep, accurate bass response. From 75dB to 85dB, the Hetyre HT9 Active Noise Cancelling Over Ear headphones give you crisp, powerful sound and quiet that helps you enjoy your music better. The goal that provides Customers with better sound quality, is our constant pursuit Much Higher-quality Built-in Microphone and NFC Technology. Hetyre HT9 provides high-quality built-in microphones for hands-free calls, Which is convenient for you to free yourself from wires. NFC pairing aided by voice prompts, promises quick and stable connection with your Bluetooth enabled devices, Powerful Bluetooth Function