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The Edifier W820NB can be connected wirelessly as well as with a cable to your device. They are designed to hug the ear, covering it completely (over ear), offering comfort and enough isolation from the environment. They have a microphone for making calls and Active Noise Cancellation technology that detects and removes external noises, so you can hear your interlocutors or music more clearly. Microphone Connectivity: Bluetooth, USB Resistance: 32ohm Users who have bought them single them out mainly because they sound good. Manufacturer Edifier Characteristics Generally TypeOver Ear Operating Time49 hours Frequency response20 - 40000 Hz Resistance32 ohms Sensitivity91 dB Capsule Diameter40 mm UseDaily ColourWhite Connectivity Wireless ConnectionsBluetooth Wired ConnectionsUSB Connection TypeWireless Features & Functions MicrophoneYes Volume ControlNo Detachable CableNo Collapsible CapsulesNo Rotating CapsulesNo Card ReaderNo RadioNo Noise CancellationActive Smart Properties Smart Assistant-