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