Features: This wireless microphone system includes 4 desktop conference microphones and 1 rack mountable receiver unit, perfect for conference, public speaking, teaching, etc. Adopts 600-690MHZ/810-865MHZ UHF frequency band to avoid interference; 4 channels and dual antenna design ensure clear and stable signal transmission. Each conference microphone has its own volume control knob on the receiver unit for adjusting the volume of the microphone separately to get desired vocal volume. The receiver has a 6.35mm audio mixing output to connect to speaker, and 4 balance XLR outputs for long distance connection to reduce the noise. The microphones and receiver both have LCD display showing the working information, which is helpful for you to use and adjust the microphone system.