Key Features . Binaural Low-Latency Bluetooth TransmissionDual-Microphone Noise Cancellation for CallWearing Detection Automatic Play and; Pause3.5 Hours Playback Time Up to 15 Hours with the CaseIP54 dust and water resistant . Fast Stable and Smooth ConnectionInstead of having a primary and secondary headphone audio can be transmitted to both ears at the same time which ensures a fast and smooth transmission. Meanwhile system wide optimisations designed to eliminate delay lag incompatibility and other disturbances help to maintain your signal quality for and undisrupted listening experience Dual-Microphone Noise Cancellation during CallsNoisy surroundings cannot compete with your voice during calls thanks to dual-microphone beamforming an environmental noise cancellation algorithm and an anti-wind noise chamber Wear Detection Automatic Play and; PauseInfrared optical sensors detect whether you're wearing the headphones or not and therefor will pause or play your audio in response so you don't need to take out your phone each time. Carefree ListeningThe W31 headphones are designed to resist water and dust at an IP54 rating. Whether you're staying in or working out you will have confidence that your earphones are protected Enjoy Your Personal Soundtrack All DayEnjoy up to 3.5 hours of continuous music before re-docking the charging case holds up to 15 hours-worth of enjoyable music playback..

Key Features . Hybrid Active Noise Cancellation and Triple-Mic Noise Reduction during CallsBinaural Low-Latency Bluetooth Transmission24 Hours of Music Playback ( 4 hours from single use)IP54 Dust and Water Resistance . Hybrid Active Noise cancellationThe W51 come equipped with a new dual-core digital noise reduction chip and more advanced hybrid noise reduction microphones. They are intelligently optimised to detect and reduce every day noises such as from subways and trains. With a noise reduction depth of 35 dB you get an undisturbed listening experience. Triple-Mic Noise ReductionEach earphone comes equipped with triple microphone noise reduction technology and redesigned air ducts to prevent noises of wind. Whether you are in the subway on the bus or riding your bike even a single earphone will capture your voice clearly. Binaural Low-Latency Bluetooth TransmissionThe W51 adopt the newest Bluetooth low-latency binaural transmission standard to greatly reduce any audio delay. This significantly improves audio-to-video synchronisation making audio lag and signal interference no longer an issue for your music and video experience. New Quality Compensation for Professional Audio PerformanceOPPO’s first true wireless headphones to be equipped with a system-wide audio quality compensation algorithm to avoid loss of audio quality from noise reduction techniques. The W51 offer quality restoration of the audio for clean uncompromised audio performance. Additionally the headphones are equipped with Dual TPU composite graphene diaphragms to provide enhanced audio response and treble performance. IP54 Rated Dust and Water ResistanceStructurally designed and certified for IP54 dust and water resistance6. Whether it is the gym or an outdoor commute listen with peace of mind knowing your headphones are safe..