Washable and easy to assemble: The easy-to-disassemble design allows for quick removal from the hat or reinstallation of the headphone speaker driver unit for cleaning in just seconds. Long battery life: Equipped with a USB charging port, a 12-hour charge provides up to 24 hours of talk time and up to 120 hours of standby time, enough for a full day's work. Bluetooth V5.4 technology: This Bluetooth knit hat uses Bluetooth V5.4 technology, providing high-definition, high-quality audio playback with a wireless range exceeding 30 feet. It pairs quickly and easily with smartphones, Apple Watches, or tablets. Warm and comfortable: Our wireless Bluetooth hat is made of soft and breathable acrylic. Perfect for skiing, snowboarding, running, and sports, it makes a great Christmas or birthday gift for family and friends. Easy to use: This minimalist Bluetooth wireless knit hat features three notification buttons on the leather ear panels. After powering on your phone, it quickly and stably connects to Bluetooth devices, enabling basic control functions such as playback, answering calls, skipping tracks, and volume control.