Bluetooth Version : BT5.0 Bluetooth Protocol : A2DP/AVRCP/HFP/HSP Chipset : QCC3020 RF Distance : 10m Driver : Ø 7.2mm Frequency Response (Output Power) : 20Hz-20kHz Earphone Battery : 43mAh Case Battery : 310mAh Earphone Charging Time : 1.5 hours Working Time : 5 hours