Bluetooth version: V5.3 Jerry AC6973D4.
Supported protocols: HSP, HFP, A2DP, AVRCP.
Battery capacity 33mAh (without protective board, earphone board lithium protection IC)
Charging compartment battery capacity: 320mAh (with protective plate)
Horn: 13MM.
Charging time: 1.5h.
Call duration: 5H.