Hi-Res Audio standard Active noise cancellation technology Ambient sound mode Built-in microphone DNN (deep neural network) noise cancellation Large driver with titanium diaphragm Low latency for game mode Up to 49 hours continuous playback Lightweight headset assures comfortable fit Superb Noise Cancelling The W820NB headphones have hybrid ANC technology that reduces noise by up to 38dB. This amplifies your music listening experience while cutting out unwanted noise. Long-Lasting Battery The W820NB headphones are complete with a long-lasting battery that's efficient and gives you 49 hours of playback time. Lightweight Design The ergonomic design makes it comfortable enough for all-day use. Stylish an appearance that's eye-catching and suits every personality. Hi-Res Certified The W820NB headphones have been approved by JAS and are complete with Hi-Res Audio Standards. The W820NB headphones are built with a large dynamic diaphragm driver and produce crystal clear sound that's rich in details. Clearer Phone Calls The W820NB headphones are equipped with voice call NC technology and enable you to have natural conversations that are smooth and complete. Edifier Connect App You can personalize the W820NB Bluetooth headphones with the Edifier Connect app for changing modes, checking battery status, and viewing the user manual. Ambient Sound Mode Switch to ambient mode and stay alert to your surroundings while listening to your music. Hear airport announcements or important notifications without taking your headphones off. Low Latency in Game Mode While in Game Mode, the latency is as low as 80ms and there's perfect synchronization between sound and images. This ensures a perfect gaming experience that will leave the player wanting more. Specifications Bluetooth version V5.0 Audio codecs AAC, SBC Driver unit 40mm dynamic driver Playback time ANC on: about 29 hours; ANC off: about 49 hours Charging time About 1.5 hours Battery capacity 400mAh Frequency response 20Hz - 40kHz Sound pressure level 91±3dB(A) Impedance 32Ω Charging port USB Type-C