Edifier W820NB Plus Wireless Headphones, ANC (green) Just you and your favorite songs. The Edifier W820NB Plus headphones are equipped with dynamic 40mm drivers for crystal-clear and detailed sound. They utilize hybrid ANC noise cancellation technology, effectively reducing noise by up to -43 dB. The built-in microphones allow for uninterrupted conversations and provide a battery life of up to 49 hours. The thoughtful design ensures exceptional comfort. Fall in love with music all over again and immerse yourself in the sounds of your favorite songs. The W820NB Plus features an integrated LDAC codec and is Hi-Res Audio certified, meaning they meet the highest audio standards. Additionally, they have 40mm drivers with a titanium composite diaphragm, which, combined with the hybrid ANC technology, allows you to fully focus on the beautiful music you are currently listening to.