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OPPO Enco W51 True Wireless Headphones
| Model | ETI21 |
| Product colors | Floral White / Starry Blue |
| Model (charging case) | ETI22 |
| Driver | 7mm dynamic driver |
| Driver sensitivity | 103dB @1KHz |
| Frequency response range | 20Hz ~ 20kHz |
| Microphone sensitivity | -38 dBV/Pa |
| Bluetooth version | BT 5.0 |
| Wireless range | 10 m |
| Battery type | Rechargeable lithium-ion battery |
| Battery capacity | 25 mAh (headphones) /
480 mAh (charging case) |
| Music play time (50% volume) | ANC on: 3.5h (single charge) / 20h (with charging case)
ANC off๏ผ4h (single charge) / 24h (with charging case) |
| Wired Charging time | 80min (with charging case) |
| Wireless charging time | 2.5h (with charging case) |
| Charging port | USB Type-C |
| Dust and water resistance (headphones) | IP54 |
| Weight (Entire device) | 55.5g |
