Active noise cancellation: Two internal microphones work together to effectively reduce 95% of external noise, such as noise from trains, airplanes, and car engines | 40-hour ultra-long battery life and fast charging: With ANC enabled, the earphones offer 5-6 hours of battery life, and in normal mode, they offer 6-8 hours. You can comfortably commute with these Bluetooth earphones without worrying about charging. A 20-minute fast charge provides an additional 4 hours of playback | Custom EQ App: Scan the QR code in the instruction manual/search to download the [Original Sound] app and customize your sound with 6 preset customizable EQ settings, or adjust it yourself. You can also switch between 3 modes: ANC, Normal, and Transparency, and relax with white noise | Six translation modes: The [Original Sound] app offers six translation scenarios supporting mutual translation between 56 languages, allowing for free communication in daily life, at work, and while traveling | Hearing surrounding sounds: When you need to be aware of your surroundings (such as traffic announcements, crossing the street, or simply staying connected with the world around you), switch to the transparency mode on your noise-canceling headphones | Package Contents: User manual. First, scan the QR code on the inside of the manual to download the [Original Sound] app. After logging in, while connected to the earbuds, you can enable heart rate monitoring, AI translation, and customize function buttons and EQ settings. Includes 4 pairs of interchangeable ear tips (XXS, XS, S, L) to ensure a comfortable fit for users with different ear shapes.