Bluetooth 5.4, small size Low Latency Super Fast Charging, 10 Mins Charging=100 mins playtime Clear Trebel, Powerful Bass, with 12mm PU+Bio-diaphragm”composite dynamic unit ENC Call Noise Cancellation Seamless Switching Between Dual DevicesVersion: Bluetooth 5.4 AI-powered Noise-free Calls 2 microphones 12mm drivers Ipx5 waterproof Bluetooth Profiles: HFP/AVRCP/A2DP/BLE/SPP Codec: AAC, SBC Bluetooth Frequency: 2400MHz-2483.5MHz Bluetooth Range: 10m Max.RF Output Power: 4dBm Charging Port: USB-C Capacity: Earbuds: 34mAh 3.85V(0.131Wh) Charging Case: 440mAh 3.7V(1.63Wh) Operating Time: About 5.5 hours of music playback with single charging; About 28 hours of music playback with charging *Charge Earbuds: About 1.5 hours Charge Charging Case: About 2 hours