Material: Acrylic Color: a variety of colors are available Size: one size Gender: Unisex Bluetooth version: 5.0 Headphone channel: Stereo 2.0 Transmission distance: 10-15 meters (according to environmental impact) Battery capacity: 150mAh Bluetooth standby time: 72 hours Charging time: 1-2 hoursPackage List 1 *Bluetooth Knitted Hat 1 *Charging Cable Due to the lighting effects and shooting angles, there is a color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size. 11. Bluetooth connection: Universal Bluetooth V5.0 version with a stable signal is suitable for all Bluetooth devices, including smartphones, tablets, laptops, etc. It syncs to any Bluetooth device in seconds and has a wireless range of 32-49 feet. 22. Built-in microphone and stereo speakers: The 3-button control panel makes this speaker cap easy to answer calls, speak hands-free, find songs, and control volume. This knitted Bluetooth beanie has superb audio quality and incredible clarity. No more earbuds constantly falling out of your ears, or worse, giving you earaches. 33. Battery performance: Built-in 150mAh rechargeable lithium-ion battery provides up to 4-8 hours of continuous playtime and standby time of up to 72 hours. The charging time: 1-2 hours (includes USB charging cable). 44. Fashionable and warm: Acrylic is a high-quality material, with no pilling, no fading, and soft and good thermal performance, winter hat keeps your head and ears warm while you enjoy music/answer questions. Perfect for outdoor sports, running, skiing, skating, hiking, exercising, dog walking, vacation travel, and more. 55. Unisex and washable: One Size Fits Most Speaker drivers and batteries are removable for easy cleaning. A must for winter outdoor sports, as a Christmas gift for men, women, dads, moms, boyfriends, girlfriends, teenage girls, and teenage boys.