Aike&reg; Soft Warm Beanie Hat Wireless Bluetooth Smart Cap w/ Headphone Headset Speaker Mic (Grey) 1. V3.0+EDR Bluetooth version, available for most devices with Bluetooth function. 2. Unisex, all-weather acrylic beanie that is soft and comfortable to wear ,looking good all year round. 3. Fashion and Lightweight design with Elastic knitted material.convenient and warm, keep away from coldness. 5. Hands-free speaker answering, able to answer phonecalls. washable Hat, headphone can be taken off. 6. Built-in Li-ion chargeable battery, charge via USB cable, long lasting time.