Driver size: 32mm/1.26" Dynamic driver, Power supply: 5V 1A, Weight: 160g, Headset battery type: Lithium-ion battery (3.7V/450mAh), Charging time: 2 hrs, Music playtime with BT on: up to 40 hrs, Frequency response: 20Hz – 20kHz, Impedance: 32 ohm, Sensitivity: 103.5dB SPL@ 1kHz 1mW, Maximum SPL: 95dB, Microphone sensitivity: -29dBV@1kHz/Pa, Bluetooth version: 5.0, Bluetooth profile version: A2DP v1.3, AVRCP v1.6, HFP v1.7, Bluetooth transmitter frequency range: 2.4GHz – 2.4835GHz, Bluetooth transmitted power: <8dBm, Bluetooth transmitted modulation: GFSK, π/4 DQPSK, 8DPSK, Maximum operation temperature: 45°C.