This system can be used for multi-language bus tour guide. The receiver has 2G flash memory and can support many languages. Each language can have 999 audio files. Visitors can switch the language by pressing a button.
The controller (transmitter) can control the playing of the receivers. When the guide presses a button on the controller, the receivers will play the corresponding files, in different language respectively.
The transmitter can also accept microphone input and transmit voice to the receivers, when there is no file playing.
