Model name: A4TECH BH220

Specifications:

• CONNECTION
  • Bluetooth Version: v5.3
  • Operating Range: Up to 10m (32 feet)
  • Built-in Battery: 400mAh Lithium Battery
  • Playback Time: 40H
• HEADPHONE
  • Speaker Unit: 40mm Hybrid Diaphragm
  • Frequency: 20Hz - 20KHz
  • Impedance: 32ohm
  • Sensitivity: 100dB
• MICROPHONE
  • Mic. Type: ENC Omni-Directional
  • Frequency: 100Hz - 10KHz
  • Sensitivity: -42dB
• CABLE
  • USB Type-C Charging Cable: 50 cm