The radio guide system consists of personal receivers with headphones for tourists and a transmitter with a microphone for the guide. The guide speaks into the microphone, and every visitor hears his voice through headphones. Each receiver has a volume control, so everyone can individually adjust the volume of the guide's voice. The devices work up to 150 meters away regardless of walls or partitions. Guided tours are a completely different level. They are brighter, more memorable and organized.