Driver size: 8mm/0.31\\\' Dynamic Driver Power supply: 5V 1A Weight: 46.3g/0.102 lbs Earpiece: 5.1g/0.011 lbs (10.2g/0.022 lbs combined) Charging case: 36.1g/0.08 lbs Headset battery type: Lithium-ion Battery (46mAh/3.7V) Charging case battery type: Lithium-ion Battery (550mAh/3.7V) Charging time: 2 hrs from empty Music playtime with BT on: up to 5 hrs Frequency Response: 20Hz - 20kHz Impedance: 16 ohm Sensitivity: 105.5dBSPL@1kHz Maximum SPL: 94dB Microphone sensitivity: -11.3dBV@1kHz/Pa Bluetooth version: 5.0 Bluetooth profile version: A2DP V1.3 AVRCP V1.6 HFP V1.7 Bluetooth transmitter frequency range: 2.4 - 2.4835GHz Bluetooth transmitter power: 10dbm Bluetooth transmitter modulation: GFSK, π/4-DQPSK, 8-DPSK Maximum operation temperature: 45°c