JBL Tune 770NC Headphones

Power supply: 5V 1A
Frequency response: 20 Hz - 20 kHz
Impedance: 32 ohm
Sensitivity: 100 dB SPL @ 1 kHz
Maximum SPL: 94 dB
Microphone sensitivity: -40 dBV/Pa @ 1 kHz
Maximum operating temperature: 45 °C
Bluetooth transmitter modulation: GFSK, π/4-DQPSK, 8DPSK
Bluetooth version: 5.3
Bluetooth profile version: A2DP v1.4, AVRCP v1.6.2, HFP v1.8
Bluetooth transmitter frequency range: 2.4 GHz - 2.4835 GHz
Bluetooth transmitter power: < 10 dBm (E.I.R.P)
Driver size: 40 mm / 1.57" Dynamic Driver
Weight: 232 g / 0.51 lbs
Battery type: Lithium-ion battery (690 mAh / 3.7V)
Charging time: 2 hours
Music playtime with Bluetooth on and ANC off: Up to 70 hours
Music playtime with Bluetooth on and ANC on: Up to 44 hours
Music playtime with Bluetooth off and ANC on: Up to 30 hours
Talk time with ANC on: Up to 30 hours
Talk time with ANC off: Up to 39 hours