Mixcder E9 Active Noise Cancelling Wireless Bluetooth Headphones 30 hours Playtime Bluetooth Headset with Super HiFi Deep Bass How does ANC Work? Mixcder E9 feature a miniature microphone in the earpiece that picks up ambient noise (such as traffic, air-handling systems, etc.). Then it generates reverse waves to cancell out the annoying sound that surround you without diminishing the audio you want to hear. Superior Sound Quality 40mm large-aperture drivers deliver premium playback with superb bass depth and high-frequency clarity. It is designed for stereo headphones. 30 Hours Battery Life with ANC on Up to 30-hour Playtime in Wireless Mode when it's fully charged; and it can provide 3-day music time via aux cable when ANC on. Qualcomm Bluetooth 5.0 Chip Compared with bluetooth 4.0, the latest Bluetooth 5.0 qualcomm chip creates a wider Bluetooth range and more robust signals, greatly upgrades your audio experience. What's In the Box 1x Mixcder E9 1x Micro USB Cable 1x3.5mm Audio Cable 1x User Manual 1x Carrying Case 1x Airplane Adapter *New or previous package will be shipped at random.