【ANC Active Noise Reduction Technology】 One click noise reduction that allows you to easily enjoy music on airplanes and other noisy environments without being disturbed. 【Bluetooth 5.0 Headphones & Built-in Microphone】 Bluetooth 5.0 offers faster transmission speed, more stable audio output and less delay. You can use the built-in microphone to make calls or hold video conferencing. 【Usage Time】 8 hours (Bluetooth + ANC) ； 16 hours (ANC) ； 30 hours (Bluetooth) We also provide 3.5mm audio cable that allows you to freely switch between wired and wireless mode. 【Comfort】 High-end lambskin earmuffs and 90-degree rotatable earmuffs have a more ergonomic headphone structure that fits the ears better and is more comfortable. Thanks to the bending angle and the padding of the head beam, you can wear it for a long time without getting tired. Due to the lower body weight, you can ignore the presence of headphones. Gentle reminder: Please remove the headset every 2-3 hours. 【Customer Service and Warranty】 Any problem within 30 days can be returned and refunded free of charge. Two year guarantee. If you encounter any problems before or after selling, please feel free to contact us. We have a professional team that is available to you within 24 hours.