DOLIROX Winter Autumn Headphone Beanie Music Cap Hat with Built-in Removable Headphons Speakers Best for Gift and Outdoor Activities (Black) 1.Suitable for all device that include a 3.5mm earphonejack 2.Keep you Warm outside while you would enjoy your favoriate music 3.Easy operating,just plug into the suitable device and play 4 Superior Sound Quality 5.The built-in Speakers can be removed if you would like to wash the beanie