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– Professional Active Noise Cancelling ANC Technology. Our improved ANC technology significantly reduces noise to help you focus on what you want to hear. – Amazing Sound with Apt – X Hi-Fi Technology. Low latency good fault tolerance high sound quality. The 90d – B give a deep powerful and crisp sound make your overall listening experience just that much better. – High-quality Built-in Microphone and Bluetooth 5.0. COWIN SE7 provides high-quality built-in microphones for hands-free calls Which is convenient for you to free yourself from wires. – The Professional Protein Earpad and Foldable Design. More durability and comfort Enjoy high-quality Long-listen comfort. Skin texture lightweight comfortable around-ear fit you can wear all day long. – Great Playtime. 50 hours playtime in Bluetooth model 30 hours playtime in bluetooth and ANC model. Technical Details Wireless: Bluetooth 5.0 Transmission distance: >15m Frequency: 20Hz-20k – Hz Noise reduction depth: -28-33d – B S/N: 90d – B Distortion: 0.5 % Charging time: 3.5 hours Life time: 50h Power supply: Lithium battery or Micro USB cable Audio source: i – Phone i – Pad Samsung Blackberry Nexus Smartphone Computer PC Notebook MP4 MP3 etc Function spec: Bluetooth5.0 APTX Microphone AUX Active Noise Cancelling.