acrylic rib knit built-in ABS Bluetooth headphones plays music for up to 5 hours can be recharged from any USB port or mains adapter headphones are easily removable from the beanie for charging and to enable the beanie to be washed. supplied with a Micro USB cable for charging supports playback from smartphones, tablets, or most other Bluetooth-compatible audio devices Includes printed gift box Acrylic: This easy-care, water-repellent fabric is lightweight, insulating, and incredibly warm.