Tour Guide Wireless Radio / Audio System.

The guide carries a radio transmitter. When he speaks, group tourists can listen simultaneously.

The guide speaks at normal volume, and visitors or tourists can listen clearly without any noise.

Moreover, the same deveices can be used in many groups without mutual interference.  

Products are widely used in guiding, training, teaching, interpreting, public speaking, etc.

Speaker can talk to the listener in a low voice even far from him.