Standby time: about 45 hours. Charging function: Data cable to charge the earphones. Horn size: diameter 16 mm. Body material: ABS + PC. Sensitivity: -85dBm. Display: charging/power display. Bluetooth version: 5.3 Charging time: about two hours. Headphone battery capacity: 40mAh Bluetooth headset transmission distance: 10 meters or less. Button/Touch: Touch Operating time: about 6 hours. Charging voltage: DC 5V. Charging port: Type-C. Charging box battery capacity: 300mAh. Frequency range: 20Hz - 20kHz.