The audio splitter cable works with StemPulse. You can use two applicators on one machine. Formerly, it was uncommon for PEMF machines to work with two applicators. However, StemPulse has offered this splitter from the very start. Use this to replace the splitter cable that came with your StemPulse or anything that requires stereo 1/8 inch connectors. Note: MultiPulse can only run one set of coils and cannot use this option.