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Key Features . Bluetooth 5.2Up to 10 hours playback with 30 hours stored in the case IP54 RatingNoise Cancellation . HiFi evolutionA pure audio experience offered by OPPO and Dynaudio 11mm dynamic unit for treble and 6mm planar diaphragm unit for bass. BES ChipCo-created innovative circuit noise cancellation structure industry-leading signal-noise ratio and total harmonic distortion (THD) performance. Active Noise ControlActive cancellation of deep (up to 40 dB) and wide-frequency (up to 3 kHz) noise. Fast Charging Charge for 5 minutes listen to music for 2 hours. Long battery life Up to 40 hours of music playback. Seamless auto switching Switching between multiple devices is now easy and seamless. IP54 IP54 dustproof and waterproof rating..