TP-WIRELESS Wireless PA System for for Conference Room,Church, Classroom (2.4GHz Microphone and Speaker) 2400MHz-2483MHz is an ISM frequency band which is legal and free all over the world. 120 selectable frequencies can support more than 100 rooms using at the same time without crosstalk. Humanized Multi-room simultaneous using solution: 1-3 meters paring distance, more than 10 meters using distance. Each microphone can use in any room installed with TP-WIRELESS speaker without crosstalk. Every teacher can have their personel microphone and use it in any classroom. The transmit frequency is automatically and synchronously set by the receiver (main speaker). Choices of installation: mounting with tripod, hanging on wall, or putting on the table directly. We provide the mounted plates as the installation accessories, you can also complete the installation work according to the instructions.