* Bluetooth version: V5.4.
* Built-in microphone and call function.
* Adjustable headband.
* Driver diameter: 40 mm.
* Control buttons.
* Battery capacity: 300mAh/3.7V.
* Working time: About 23 hours of talk time or 36 hours of music.
* Frequency range: 20 Hz - 20 kHz.
* Microphone sensitivity: 105dB.
* Speaker impedance: 32 Ohm.
* Charging time: About 4 hours.
* Size: 190x166x75mm.
* Warranty: 12 months.