TitanOPS Bluetooth Beanie (Black) New 4.1 version bluetooth. Simple and fast connecting to your smart devices. Wireless range: 33 feet. Rechargeable high capacity Li-Ion battery: Support 6-8 hours working time, 150 hours standby time. Full charging time 2.5 hours. Soft and warm feeling: Double layer, heavy duty high end 30% cotton+70% Acrylic material. Thrums free. Neat stiched bluetooth Logo. Universal size and fully washable: One size for all people. Simply take out the headphone and put it back after cleaning.