SpecificationsProduct Type Open Ear Air Conduction HeadsetBluetooth Version Bluetooth V5.2Bluetooth Chipset QCC3040, Qualcomm True Wireless Mirroring, CVC8.0Audio Decode SBC Apt-XWireless Range 15 meters (Free Space)Speaker Diameter 15.4mm, N40 NeodymCharge Voltage & Current:DC5V@1AMusic Playback HoursUp to 6 Hours +20HBattery Type Li-ion Polymer Battery 70mAh*2 + 500mAh ExtraCharing time about 5.5 hours to charge the case, about 2 hours to charge the earbudsWater resistance IPX5