Edifier W820NB Active Noise Cancelling Wireless Bluetooth Stereo Headphone Headset 46 Hours Playtime, Bluetooth V5.0, Hi-Res Audio Black Feature: Hi-Res Audio standard for a rich listening experience Active noise cancellation technology isolates unwanted noise Large driver with titanium diaphragm delivers crystal-clear sound Low latency for game mode Up to 49 hours continuous playback Lightweight headset assures comfortable fit Built-in microphone supporting calls in Bluetooth connection 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 Product Weight 220g (net weight) Inner Carton 188mm×88mm×240mm (L×W×H), 450g (gross weight)