This cable plugs into the EdSets headsets and has a coiled section that splits into a 3.5mm stereo jack and a 2.5mm microphone jack for use with any Zumo or similar device that requires a microphone input and speaker output.  It was designed for use with the Zumo 550 in mind and will work with any product that has similar input and output jacks.  Some systems may require a powered microphone that can be supplied.  NOT designed for integrating Zumo with Goldwing system.   See our GL1500/1800 Mic Splitter for that.