The Sennheiser SKM500 is a lightweight, black-finished aluminium portable transmitter. Because the G4 500 Series portable transmitters are intended for professional live sound applications, the microphone lacks a mute option. This guarantees that the Sound Engineer mixing the concert maintains complete control of the sound and avoids any confusion. Users in need of a wireless microphone with a mute switch may find suitable models in the 300 or 100 G4 Series.