The two-way portable Wireless Audio Transceiver (WAT) WAT-01TW system consists of an audio transmitter and a set of transceivers. The guide can speak to the transmitter and visitors can hear from the receivers. When a visitor presses a button on the receiver, he can speak to the handset and all the others in the group will hear him. It allows the people in one group to interact with each other. It is very good for factory tour guide.