| Manufacturer | A4Tech |
| Model | B20 |
| Type | Wireless |
| Color | Grey |
| Frequency | 20 Hz-20 kHz |
| Specifications | Speaker Size: 13 mm;Earphone Sensitivity: 102 dB @ -10 dBFS;Mic. Sensitivity: -42 dB @1 kHz/Pa;Bluetooth Version: v5.2;Operation Distance: 10 m;Earphone Battery Type: Lithium Battery (40 mAh);Charging Power: 5V=500mA |