With the HME PRO850 Wireless Intercom System, you'll get exceptional operating range, cutting-edge features and the flexibility to configure and expand the entire system to meet your unique communication needs. With more value, better performance and greater reliability, the PRO850 is the ultimate solution for all your intercom needs. Innovative features like PC interface, automated power control, simultaneous dual-channel interface, Wireless ISO – plus all the standard capabilities – give you more operating power and flexibility to achieve the best performance. Combine all that with a ruggedly-constructed design, the HME PRO850 provides the utmost reliability and sound quality. Up to 4 full duplex/16 push-to-transmit beltpacks per base station and up to 3 bases can be linked to support up to 48 wireless users. NOTE: Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from an other device.