Excellent intelligent noise reduction function, bringing more natural and comfortable sound. Convenient Single Button Operation: With just one button, you can easily adjust the six-stage volume and four modes. It pursues usability, making it easy for anyone to use. Long Use Time: Low Battery Consumption Up to 15 hours of Use, and the Charging Case Provide 5 Times Recharge Cycle For Both Devices. Auto Detection ON/OFF: Automatic detection for seamless operation - powers on when worn, powers off when removed.