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 the head. The headband supports tightness adjustment to better adapt to your head sizes. | Up to 55H Playtime: Equipped with a 500mAh capacity battery, this wireless bluetooth headset supports up to 55 hours of music playback or 30 hours of non-stop calls. Making it easy to use on the go. When the headset's power is less than 10%, it will remind you to charge it with a voice. Supports quick full charging in 1.5 hours. | Easy to Use: With a 120° rotatable noise cancelling microphone, you can move it up and down to quickly switch to mute mode. The headphones have volume buttons and a red indicator light so you can adjust the volume during meetings and let others know you're busy to avoid interruptions.