Technical specifications: Driver size: 12 mm/ 0.472” Dynamic Driver Power supply: 5V 1A Earbud: 4.8 g per pc (9.6 g combined)/0.011 lbs per pc (0.021 lbs combined) Charging case: 38.6 g/ 0.086 lbs Earbud dimensions (Height * Width * Depth): 34.9*20.5*20.2mm/1.37*0.80*0.79in Charging case dimensions (Height * Width * Depth): 47.0*51.5*29.3mm/1.85*2.02*1 .15in Earbud battery type: Lithium-ion polymer (55 mAh/ 3.85 V) Charging case battery type: Lithium-ion polymer (570 mAh/ 3.85 V) Charging time: < 2 hrs from empty Talk time: 4.5 hrs Music playtime with BT on and ANC off: up to 8 hrs Music playtime with BT on and ANC on: up to 6 hrs Frequency response: 20 Hz – 20 kHz Impedance: 32 ohm Sensitivity: 110 dB SPL@1 kHz Maximum SPL: 95 dB Microphone sensitivity: -38 dBV/Pa@1 kHz Bluetooth version: 5.2 Bluetooth profile version: A2DP V1.3, AVRCP V1.6, HFP V1.7 Bluetooth transmitter frequency range: 2.4 GHz - 2.4835 GHz Bluetooth transmitter power: <11 dBm Bluetooth transmitter modulation: GFSK, π/4-DQPSK, 8DPSK Maximum operation temperature: 45 °C IP Rating: IPX4