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Bluetooth 5.3 TWS earbuds with mic Easy pairing & operation Energy-saving Bluetooth V5.3+ BR+EDR+BLE+ACC interface Support for A2DP, AVCTP, AVDTP, AVRCP, HFP, SPP, SMP, ATT, GAP, HATT, RFCOMM, SDP, L2CAP protocols Touch operation Works with most Bluetooth-enabled devices Frequency response: 20Hz – 20kHz Sensitivity: 110dB +/- 3 dB /1 mW Microphone sensitivity: -42 dB±3dB Transmission power/frequency: Class 2/2.4 Ghz, range up to 10m Power supply: advanced lithium-polymer battery, up to 5 hours of battery life (up to 15 hours when recharging from the charging case) Charging the headphones: ~ 1 h, charging the charging case battery: ~ 1.5 hours. USB-C charging socket Dimensions: 17x31x15mm (single earphone); 46x46x23mm (charging case) Headphone weight: 2 x 2g Charging case weight: 19g