The 180's Bluetooth II Earwarmer uses wireless Bluetooth® technology to allow you to take calls and listen to music from other Bluetooth enabled devices. At a full charge these ear warmers allow for 8 hours of music or 9 hours of talk time, and they can be left on standby for 100 hours! They come with a USB charging cord. A soft shell body and grid fleece lining provide warmth and comfort with the added protection of wind and water resistance. A Patented behind-the-head design fits comfortably over your ears and allows them to be worn with other headwear and head protection and adjustable click-to-fit frames allow for a wide variety of head sizes.