Acrylic knit;Beanie with wireless headphones; Power/Technology: Rechargeable Lithium Polymer battery: 37V/200 mAH; Input: 5V; Output Power: 2W x 2; Work current: 200 mA in charging; Frequency response: 20Hz-20 kHz; Transmission range: 10m (32 feet); Wireless V 42; Playback time: Approx 3 to 35 hrs depending on usage; Must be charged prior to first use Charge time varies by device; Instructions and charging cable included; LED indicator lights; Product Size: 8″ w x 10″ h; Shipping available only to contiguous U.S. addresses via Ground.;