The GT-SET-FOUR is a 20 way charger rack mountable complete with ear piece & microphone. The Clockaudio GT-SET-FOUR guided tour system helps tour groups overcome disturbing background noise and distance from the guide even in noisy surroundings. The system consists of a transmitter, 19 pocket size receivers with rechargeable batteries and a rack mountable or stand alone charger. It is easy to set up and use and operates over a distance of 100 meters. When fully charged the system can be used for 8-10 hours. The system is suitable for in and outdoor guided tours, and can also be used in meetings where one or more interpreters provide real time translation. It accommodates any number of users with additional receivers. The Clockaudio Wireless Tour Guide System is easy to use and requires no installation.