Maxell Dynamic+ wireless headphones with charging case Bluetooth black

<b>Battery</b> USB charging: Yes Wireless audio playback time: 4 h Power source type: Battery Battery recharge time: 2 h Charging case: Yes <b>Headphones</b> Headphone frequency: 20 - 20000 Hz Headphone sensitivity: 94 dB +/- 3 dB Impedance: 32 ? <b>Microphone</b> Microphone type: Built-in <b>Packaging content</b> Ear tips: 3 pairs Charging case: Yes Headphones: Y USB cable: Y <b>Performance</b> Control type: Wireless Oven control type: Touch Operating keys: Mute Operating keys: Play/Pause, Skip down, Skip up, Stop Operating keys: Answer/end call Recommended usage: Calls & Music Bluetooth range: 10 m Wearing style: In-ear Product type: Headphones Product colour: Black <b>Ports & interfaces</b> Bluetooth: Yes Connectivity technology: Wireless USB port: Yes USB port type: USB Type-C