Quick overview from the supplier:
Edifier ES850NB Black / Bluetooth Over-ear headphones with microphone, ANC, BT V5.4, LDAC codec with Hi-Res Audio & Hi-Res Wireless certification, Dynamic driver 40 mm, Frequency response 20 Hz-40 kHz, On-ear controls, Ergonomic Fit, Battery Lifetime (up to) 92 hr, charging time 1.5 hr, Foldable
