Black Calls/Music Head-band Headphones Wired & Wireless 3.5 mm connector USB connectivity Bluetooth 5.3 15 m Circumaural 20 - 20000 Hz 1693 dB Microphone type: Built-in -36 dB Built-in battery Lithium Polymer (LiPo) 750 mAh airplane engines A completely reworked noise canceling system that targets and blocks a wide variety of noise sources, from babies to crying. So you will be able to enjoy your personal space wherever you go.Make All Spaces Your Own:Whether indoors or outdoors, commuting or flying... Space Q45's adaptive noise canceling system automatically determines the appropriate level for your location. You can also use the app to choose 1 of 5 noise canceling levels.Ideal for Traveling: The noise canceling mode's 50-hour usage time is enough to take you around the world on flights without having to recharge your headphones. In normal mode, the usage time can be up to 65 hours; When your battery is low, you will get 4 hours of use when you charge your headphones for 5 minutes