Bluetooth version:5.3

Call time: About 3.7 hrs

Play time: About 4.5 hrs

Transmission distance: About 10m

Headphone standby time: About 40 hrs

Headphone charging time: About 2hr

Charging box charging time: About 2hrs

Bluetooth protocol: HFP/A2DP/HSP/AVRCP

Headphone batiery capacity: 3.7V 30mAh

Charging box batiery capacity: 3.7V 300mAh