OGG K6 Wireless Earbuds ANC Bluetooth Earphones Active Noise Cancelling Color: Black Open box, little or no use tested complete OGG K6 Wireless Earbuds Bluetooth Earphones, Active Noise Cancelling Headset, Wireless Bluetooth Earbuds with Mart Touch,8 Hours Playback and 55 Extra Hours of Charging Case With the new generation of Bluetooth chip version 5.1, the latest active noise cancelling and Environment noise reduction technology, 10mm speaker specially researched and developed for noise reduction, can greatly reduce environmental noise . Even if you make a call in a noisy environment such as airport, railway station, etc., it is like communicating with people face to face. Both parties can clearly hear every word on the phone.