Over-ear, Bezicne, Bluetooth 5.2, Effective Range 10m, 2.4 GHz band (2.400 0 GHz - 2.483 5 GHz), Driver Unit 30mm, Profile A2DP, AVRCP, HFP, HSP, Supported Audio Format(s) SBC, AAC, Supported Content Protection SCMS-T, Battery Charge Method USB, Battery Life Max. 40 hours, General Features (Active Headphones) Max. 50 hours, Lithium Battery, Color Black