The GT-SET-THREE is a 30 way charger in flight case complete with ear piece & microphone contain 29 Receivers, 1 Transmitter. Clockaudio GT-400 tour guide system helps tour groups overcome disturbing background noise and distance from the guide even in noisy surroundings. The system consists of a transmitter, a number of pocket size receivers with rechargeable batteries and one of several charging stations. 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. For use on individuals or group situations such as narration or instructional use on guided tours, museums, Zoos, factories, garden events, language tuition, or any indoor / outdoor activities. Charger complete with 29 x 863 – 870MHz GT400R receivers and 1 x 863 – 870MHz GT400T transmitter.