This beanie will keep you warm on-the-go and wire free with the integrated stereo speakers, mic and controls for wireless music and hands-free calls. Fashionable, functional tech just got personal again. Number of Batteries: 1 Features: Battery Operated, Bluetooth Compatible Battery Type: Lithium Ion, Rechargeable Tech Compatibility: Universal Measurements: 1 Width/Inches, 8.6 Length/Inches, 8.2 Height/Inches Base Material: 100% Plastic Country of Origin: Imported