High-quality in-ear monitor cable that delivers transparent sound with an ultra-wide dynamic range. BT251-BK Bluetooth wireless adapter cable for in-ear monitoring fulfills your needs at a price that is very kind to every budget! Rotating MMCX connections provide perfect fitment for all ears with lasting comfort. When fully charged, BT251-BK provides up to 7 hours of music playback. They come with high-quality USB charging cable for quick charge on the go. A low battery voice prompt is also built in for convenience.