A full duplex tour guide system allows for continuous two-way communication between two people. Each has a transmitter device with an earphone microphone connected which is used talk and listen. There is no push-to-talk button to activate speech making this system ideal for many applications which require handsfree communication. These high-quality devices have a range of 100 metres and can be used for up to 8 hours. They run on standard or rechargeable AA batteries.