Huawei ROC Freebuds Studio Wireless Bluetooth Headphones Roc-CU02 AI-empowered noise cancellation Built with high-end acoustic mechanisms consisting of a large number of sensors to achieve unparalleled noise-canceling effects with ANC mode, Awareness mode, and call noise cancellation. Versatile noise canceling modes Two ANC microphones (FF + FB microphones) on each side achieve hybrid ANC effects, so that you can choose to enable ANC. HD voice call with a 6-microphone design The 4 outer microphones enhance voices by generating forward sound waves and The 2 inner microphones picks up pure voices conducted in the ear which delivers crystal clear voice to other parties. Advanced HD audio coding and decoding in a wide frequency response range Provides an ultra-wide frequency response range of 4 Hz to 48 kHz, accurately presenting rich details of high-resolution audio, and delivering a vivid and immersive audio experience. Smart Control Swipe up for Volume up, Swipe down for Volume down, Swipe left for Previous song, Swipe right for Next Song, Double Click for Play/pause music, answer/end call, Press and Hold for 2 secs to activate voice assistant/reject call.