It’s common to see three or four tour guide teams conducting guided tours simultaneously at museums during peak tourist seasons; large enterprises receiving multiple inspection groups for factory visits need to arrange several commentators for divided explanations; at high-end exhibitions, explainers in different exhibition areas introduce products to customers at the same time... In these multi-to-multi guiding scenarios, many person in charge of venues, enterprises and exhibitions have run into problems: either the tour guide systems suffer from signal crosstalk, or there is poor coordination between main and assistant commentators, leaving the audience unable to hear the explanations at all. Choosing a suitable multi-to-multi wireless tour guide system can not only solve these practical problems, but also greatly improve the professionalism of guiding services. Yingmi has been deeply engaged in the tour guide system industry for 18 years, served more than 7000 customers across various scenarios, and has gradually figured out the scientific way to select multi-to-multi wireless tour guide systems.