Features: This wireless microphone system includes 2 headset mics with bodypack transmitters + 2 handheld mics + 1 rack mountable receiver, suitable for public speech, classroom teaching, business meeting, 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 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 bodypack transmitters, handheld mics and receiver both have display for showing the working information, which is helpful for you to use and adjust the microphone system.