1. Noise cancellation communication - Bluetooth call center earphones have noise cancellation function, which can keep background noise outdoors and clean surrounding noise to create clear communication. 2. Comfortable to wear - the microphone supports 270 degree rotation. Adjustable headband, suitable for heads of different sizes to wear, even if worn for a long time without feeling fatigue or pain. 3. Charging dock - convenient for storing and charging headphones, making your computer desktop cleaner and more aesthetically pleasing. Make your work easy. 4. Long talk time - Type-C fast charging, which has a built-in 300mAh lithium battery, can provide you with up to 20 hours of ultra long continuous talk time. You don't have to worry about it suddenly losing power. 5. HiFi Sound Quality - Experience HiFi lossless music to the fullest, providing a truly stunning audio experience. Clean and thorough, using PET diaphragm to restore the true sound.<br><br>6. Universal Compatibility - This call center Bluetooth earphone can connect to devices such as computers, phones, and desktops with Bluetooth devices, achieving clear, stable, and smooth communication without jamming or delay. Product Name: Bluetooth Earphones Transmission distance: 10 meters Battery capacity: 300mAh Working hours: 8-20 hours Charging time: 2H Input voltage: DC5V 1A Charging port: Type-c Speaker impedance: 32 Ω Speaker diameter: 30mm Microphone sensitivity: 105dB ± 3dB Colour:Black Material:plastic<br><br>Package Contents: 1 x Bluetooth earphones 1 x Base<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.