The Homesound rechargeable bluetooth beanie hat is made of soft acrylic and is warm and comfortable, Size 21.5 X 22 Cm, This beanie hat's built in bluetooth module will work with most bluetooth-enabled devices, Such as Iphone, smart phones, tablets Etc. It will allow you to make / answer phone calls in seconds and has a wireless range up to 33 feet. The Homesound bluetooth cap built-in high density lithium-ion battery with only 2 hrs charging time can provide up to 6-8 hrs talk / music time, Also recharged easily by micro USB the bluetooth hat is washable and removes the built-in headphones from the inner pouches before washing. Perfect for Gym, fitness, workout, sports, outdoor sports like running, skating, hiking, camping and so On.