The Homesound Rechargeable Bluetooth Beanie Hat Is Made Of Soft Acrylic And Is Warm And Comfortable, Size 21.5 X 22Cm, Suitable For Most People. This Beanie Hat'S Built-In Bluetooth Module Will Work With Most Bluetooth-Enabled Devices, Such As iPhone, Smart Phones, Tablets Etc. It Will Allow You To Make/Answer Phone Calls In Seconds And Has A Wireless Range Up To 33 Feet. The Homesound Bluetooth Cap Built-In High-Density Lithium-Ion Battery With Only 2 Hrs Charging Time Can Provide Up To 6-8 Hrs Talk/Music Time, Also Recharged Easily By Micro Usb The Bluetooth Hat Is Washable And Removes The Built-In Headphones From The Inner Pouches Before Washing. Perfect For Gym, Fitness, Workout, Sports, Outdoor Sports Like Running, Skating, Hiking, Camping And So On.BenefitsWarm And Comfortable And Suitable For Most People Make/Receive Hands-Free Phone Calls Compatible With Most Bluetooth-Enabled Devices 2 Hours Charge Time, 6/8 Hours Talk/Music Playback Time