A traditional tour guide system pushes the guide's voice to every listener, but it cannot carry anything back. The YingMi 008S is a full-duplex guide system on 2.4G wireless. One host links to a group of sub-units, so the guide can address everyone and any guest can ask for a direct two-way call. Each group has its own manual pairing and channel lock, so several tours can run in the same venue without audio crossing over. For operators, that means one system for guided tours,
