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OPPO Enco W51 True Wireless Earphones White Kay Features: Hybrid Active Noise Cancellation Qi Wireless Charging Support Triple-Mic Noise Reduction During Calls IP54 Dust and Water Resistance Up to 24 Hours of Music Playback Includes 12 months Manufacturers Warranty Model : ETI21 Product colors : 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 : Bluetooth 5.0 Wireless range : 10 metres Battery type : Rechargeable lithium-ion battery Battery capacity : 25 mAh (earphones) / 480 mAh (charging case) Music play time (50% volume) : ANC on: 3.5h (single charge) / 20h (with charging case), ANC off：4h (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 (Earphones) : IP54 Weight (Entire device) : 55.5g