COMFORT AND WARMTH--100% Acrylic material provides the Bluetooth beanie with maximum comfort and warmth. Advanced knitting techniques ensures the hat with good air permeability.The exterior features comprehensive stitching for longevity and the inside is fleece-lined to retain heat.The Bluetooth beanie hat is stretchable, fit for everyone. The headphone is removable if you want to wash it. LATEST BLUETOOTH TECHNOLOGY-The latest 4.2 version Bluetooth technology offers the wireless Bluetooth hat with a very good and fast experience of paring,low loss high quality stereo sound. The wireless range can reach 33feet. BUILT-IN RECHARGEABLE LITHIUM-ION BATTERY-The Bluetooth beanie headphone supports 5-6 hours Talk/Music Time(at max 70% volume),60 hours standby time, 2 hours charging time. It is rechargeable with micro-USB charging cable provided,perfect partner for your outdoor winter sports such as running,skating,hiking,skiing,ect. EASY TO USE-The simple panel display of the Bluetooth beanie has 3 prompt buttons and an LED indicator light.You can skip back and forth to choose your favorite songs, and answer your incoming calls by simply pressing the Play button. WARRANTY & SUPPORT-Buy the Bluetooth beanie right now to enjoy 1-year manufacture warranty for replacement or reimbursement. We will offer you the most satisfactory customer service support.