Weight and dimensions Product weight: 312 g Efficiency Control Type: Slide-out, Buttons Wearing style: Headband Product color: Black LEDs: Yes Headset type: Stereo Application: Calls/Music Foldable: Yes Detachable cable: Yes Product type: Headset Volume control: Button Package contents Wires Alternating current USB Type-C Travel bag: Yes Ports and interfaces Connectivity: Wired and wireless Bluetooth version: 5.0 USB connector: USB Type-C Bluetooth: Yes USB connection: Yes 3.5mm connector: Yes Battery Battery powered: Yes Fast charging time: 10 min Music playback time: 40 h Charging source: USB Microphone Microphone type: Built-in microphone Safety warning Warnings Do not use near sources of heat or fire. Keep away from children. Check the condition of the batteries regularly to prevent leakage. Headphones Impedance: 32 Ω Sound pressure level: 95 - 100 dB Frequency response: 20 - 20000 Hz Headphone construction: On-ear