... Microphone System Suppliers Model No.: RC2408 Frequency: 2400-2480MHz Channels: 80 Distance: Up to 180m Certificate: CE, RoHS China Tour Guide ... radius is about 180 meters. On the same occasion, 80 groups of reception groups can be accommodated at the same time, and there ... will be no interference between the groups. It can also input MP3 voice transmission, and the receiving ...