Weight and dimensions Product height: 177.8 mm Product width: 171.4 mm Efficiency Operating buttons Volume - Volume + Foldable: Yes Headset type: Stereo Wearing style: Headband LEDs: Yes Application: Calls/Music Product type: Headset Volume control: Digital Product color: Black Package contents Suitcase: Yes Ports and interfaces Connectivity: Wired and wireless USB connection: Yes 3.5mm connector: Yes Bluetooth: Yes Battery Music playback time: 40 h Supported battery type: Built-in Rechargeable battery: Yes Charging source: USB Standby time: 40 h Other functions Audio output channels: 2.0 ch. Brand Compatibility: Any brand Interface type: Bluetooth Number of buttons: 3 Microphone Microphone type: Built-in microphone Headphones Headphone construction: Circumaural