Do you use plantronics lsquoh seriesrsquo headsets and want some extra amplification then this is the cable you need the a10 11 bottom cable is a simple plug and play device that will increase the amplification quantity of lsquoh seriesrsquo headsets to the higher polaris level easy to use the cable will connect all plantronics corded headsets to compatible phones is lightweight and simple to use how it works the a10 11 has a bigger capacity than other bottom cables