Description: Definitely, our product has good wind-proof performance so that it can be used in winter to avoid your head get cold. And it is durable because the high-quality stitching technology and dense routing is used. Needless to say, our product has high elasticity and cozy texture, which it is comfortable to wear. And it also has long battery life because it has the built-in safe high-capacity battery, which it can play music and make calls conveniently. It is made from acrylic fiber, is durable to use. The length of the product is 22 cm, the width is 21 cm. Our blue tooth support for computers, cell phones, tablets, laptops wireless connection, bluetooth-compatible effective output range of 10 m. Item Name: Knit Bluetooth-compatible Beanie Material: Acrylic Fiber Features: Vibrant Color, Soft, Breathable Battery: Built-in 200Ma Battery Size Details: 22cm x 21cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Knit Bluetooth-compatible Beanie 1 x USB Cable 1 x Manual