COWIN E7 PRO [2018 Upgraded] Active Noise Cancelling Bluetooth Headphones Over Ear No wire. No noise. 30 Hours Playtime and Clear Sound with Deep Bass. Professional Active Noise Cancelling Technology: Much better Noise Cancellation for travel, busy office and anywhere in between. Noise Cancellation Level: 30±2db Much Better Sound: High-quality built-in Microphones and 45mm large-aperture drivers give you crisp, powerful and quiet sound. (S/N: ≥85dB) Upgraded Soft Ear Cushions: comfortable around-ear fit you can wear all day long Advanced Bluetooth 4.0 and NFC: quick and stable connection with your Bluetooth devices More Stable Battery Life: A built-in 800mAh battery supports 30 hour playtime per full charge in Bluetooth mode or NC mode.