True Wireless (TWS) Stereo Headphone with wireless charging functionOperation RangeUp to 15 metersSupportsHSP/HFP/A2DP/AVRCP protocolFrequency Response Range21Hz-18KHZUp to 10 metersBuilt-in high-sensitivity microphoneMusic Playing Time 3 hoursTalk Time 2.5hoursStandby Time100 hours