Bluetooth version:V5.0
support profile:A2DP v1.3, AVRCP v1.6, HFP v1.7, HID v1.1, AVCTP v1.4, AVDTP v1.3, and SPP v1.2
working distance range:10m
speaker size:8mm
frequency range:2.402GHz-2.480GHz
battery specification:1. earphones:3.7V,55mAh 2. charging box:3.7V,500mAh
(it can charge the earphones for 4 times when it fully charged)
charging voltage:DC 5V
charging time:1. earphones:about 2 hours 2. charging box:about 3 hours
music time:about 3.5 hours