Technical Specifications: General specification: Driver size: 8 mm/ 0.315” Dynamic Driver Power supply: 5 V 1 A Earbud: 4.5 g per pc (9 g combined)/ 0.0099 lbs per pc (0.0198 lbs combined) Charging case: 34g/0.075lbs Earbud dimensions (Height * Width * Depth): mm/in 21.5*20.4*15.8/0.85*0.8*0.62 Charging case dimensions (Height * Width * Depth): mm/in 68.9*37*26.7/2.71*1.45*1.05 Earbud battery type: Lithium-ion polymer (47 mAh/ 3.8 V) Charging case battery type: Lithium-ion polymer (550 mAh/ 3.8 V) Charging time: <2 hrs from empty Music playtime with BT on: up to 8 hrs Talk time: 4.5 hrs Frequency response: 20 Hz – 20 kHz Impedance: 16 ohm Sensitivity: 100 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: <10 dBm Bluetooth transmitter modulation: GFSK, π/4 DQPSK, 8DPSK Maximum operation temperature: 45 °C