• Warm winter hat: Enjoy an enhanced music listening experience with advanced digital sound, balanced deep bass, dynamic mid-range, and crisp high notes while staying warm. • Bluetooth compatible: High-quality elastic knit material. Universal for connecting to media playback devices, including smartphones, tablets, laptops. • Great performance: Intuitive control buttons and built-in high-density rechargeable lithium battery to handle 6 hours of hands-free calls and 5 hours of wireless music streaming remotely from up to 33 feet away with a clear line of sight. Built-in easy-access MicroUSB charging port (MicroUSB cable included). • Soft and comfortable material: Features premium soft knit fabric to provide maximum comfort. This COTOP Bluetooth hat is perfect for outdoor sports, running, skiing, skating, hiking, training, walking the dog, traveling on vacation, etc. • Detachable and washable: The Bluetooth headset can be separated from the hat for washing. This unisex winter knit hat is also an ideal gift for family and friends.