Smart AI Noise Cancelling Technology: The microphone of this bluetooth headset equipped with a Qualcomm chips picks up all environmental noise and human voices, and dynamically suppresses up to 99.8% of environmental noise through ENC technology. Intelligently eliminate noise and optimize audio, with a noise reduction depth of up to 44dB. Enhance your voice during call and work. Bluetooth 5.0 & USB Dongle: Easily turn on Bluetooth on your phone or computer and connect to this wireless bluetooth headphones with mic to enjoy stable wireless calls up to 15m/50ft. With USB dongle, it is compatible with more PC and laptops. Communication is no longer bound by traditional headphone cables. Over Ear Design: This wireless bluetooth headset can greatly improve the wearing comfort of your ears. Improves sound concentration and relieves ear pain. The headset weighs only 144 grams. When worn for a long time in daily office and entertainment, it will not cause a strong sense of weight on