... Acrylic Fibers many colors in choice warm and comfort low price hat with MP3 built-in headphones Model : BH- ... -Wool material ,for a comfortable ,warm fit-One year warranty -Samples is available before mass order ... .5W2) Speaker Unit: 32Ω/0.5W, 40mm3) Frequency Response:20HZ---20KHZ 4) Audio Input: Universal 3. ... tunes while keeping your ears nice and warm in winter.Compatible with all MP3 players ,Ipods, ...