Edifier W820NB Plus Active Noise Cancelling Wireless Bluetooth Stereo Headphone Headset 49 Hours Playtime, Bluetooth V5.2, Hi-Res Audio wireless -Green 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 V5.2 Bluetooth Profile A2DP, AVRCP, HFP, HSP Audio codec SBC, LDAC Driver unit 40mm dynamic driver ANC Depth Around -43d - B Playback time ANC on: about 33 hours; ANC off: about 49 hours Charging time About 1.5 hours 10 mins=7hrs Battery capacity 400m - Ah Frequency response 20Hz - 40k - Hz Sound pressure level 91±3d - B(A) Charging port USB A to USB-C Cable (wired) Edifier connect App Product Weight 220g (net weight) Inner Carton 188mm×88mm×240mm (L×W×H), 450g (gross weight)