Noise Cancellation Communication: The Bluetooth call center headset features noise cancellation that keeps background noise out and cleans surrounding noise to create clear communication. Comfortable to wear: the microphone supports 270° rotation. Adjustable headband, suitable for heads of different sizes, without feeling fatigue or pain even if worn for a long time. Universal compatibility: This call center bluetooth headset can connect to computers, phones, desktops and other devices with bluetooth devices to achieve clear, stable and smooth communication without jams or delays. Long talk time: Type-C fast charging, it has a built-in 300mAh lithium battery, which can provide you with long continuous talk time of up to 20 hours. You don't have to worry about it suddenly losing power. Upgraded bluetooth: The advanced bluetooth CSR8615 chip ensures the stability and smoothness of the connection, thereby providing you with stable and smooth phone calls and allowing you to receive excellent customer service.HiFi sound quality-Extremely experience HiFi lossless music, and experience real and shocking sound quality. Clean and thorough, using PET diaphragm to restore the true original sound. Parameter: Product name: Bluetooth headset bluetooth version: 5.4 Transmission distance: 10 meters Battery capacity: 300mAh Working hours: 20 hours Charging time: 2 hours Input voltage: DC5V 1A Charging port: Type-c Frequency response: 20HZ-20KH Speaker impedance: 32Ω Speaker diameter: 30mm Microphone sensitivity: 105db Speaker output power: 20mW Colour:black Material:ABS Package Contents: 1 * Bluetooth headset 1 * Charging cable (excluding the base) 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.