The Sound Town NESO-U4 Series offers premium design and rock-solid quality, along with easy setup and operation. The system has a detachable rack mountable receiver (rack mount ears are included in the package) with four cardioid microphones. Its Wide Frequency Response Digital Control Circuit resists unwanted interference with a 60 dB signal to noise ratio and a 45 dB carrier wave. The low THD (Total Harmonic Distortion) technology protects your PA system from pops and distortion and produces accurate reproduction of an audio recording. It is perfect for any small to medium-sized venues.