The Kuura Bass wireless headphones are comfortable and easy-to-use headphones. The padding increases comfort and allow long-term use of the headphones. The headphones have a memory card slot, which allows them to be used as an mp3 player. They also boast a large battery, which provides up to a 10-hour playback time. Product information Bluetooth v.5.0 Internal Microphone Memory card slot Playback time: 6-10 hours Charging: Micro-USB Buttons for controlling playback Operating distance: 10-20 m Package contents: Headphones, charging cable and 3.5mm AUX cable