They have built-in headphones and can sync with your phone.
Brad's Deals Editor Candace,
Through 12/31, this Wireless Bluetooth Beanie Hat with Built-In Headphones 2-Pack, listed at $59.98, drops from $29.99 to $17.99 when you enter our coupon code BRADS2PKB at checkout at Yugster. At $9 per beanie, this ties with the lowest price we've seen on these beanies to date, which sell for $10-$17 each anywhere else. They are available in five color choices, have built-in headphones, and can sync with your phone using bluetooth. They also have a built-in mic so you can take calls. Note that it is past the deadline for orders to arrive in time for Christmas. There is no sales tax (except UT).