Reduce 90% Ambient Noise The active noise cancellation technology blocks 90% of low and medium frequency noise, such as car and airplane engines. It immerses you in a purer world of music without any distractions. Hi-Res Sound with Deep Bass The custom 40 mm dynamic drivers ensure the best Hi-Res audio quality, and you will enjoy music with rich details and extraordinary clarity. It is one of the best partners for your working task or travelling. Stable Bluetooth Connection The built-in Bluetooth 5.0 chip ensures seamless signal transmission within 33 feets(10m), easy to pair, and promises quick and stable connection with your various Bluetooth devices, such as iPhone, iPad, Android smartphone, MacBook, TV, etc. (NOTE: For TV without built-in Bluetooth, a Bluetooth transmitter should be prepared) Most Flexibility It is foldable headphones for easy carrying and saves a lot of space for you. The headband can be adjustable as you like for a better size. You can swivel the earcups within 90°for a more comfortable wearing angle. The earpads are so cozy without pressure on your ear for long wear. Tips 2: Please turn off ANC when not using headphones to save power. 40 H Playtime with Fast Charging You can enjoy music playtime all day without power shortage worries. It has a large capacity battery life, and supports 40 hours of playtime once it gets fully charged. 10 minutes of charge time provides 6 hours of music playback. Clear Hands-free Calling ZIHNIC ANC headphone is equipped with high-quality microphones, which ensures you have clear calls hands-free anytime and anywhere, and it is much more convenient to free yourself from wires, and you will get efficient communication with friends or clients.