The Shure SM58S is a variant of the iconic SM58 dynamic vocal microphone, distinguished by the inclusion of a built-in on/off switch. This switch provides a convenient and immediate method for performers or presenters to mute the microphone without needing to adjust the mixer channel, making it particularly useful for applications where quick muting is required, such as in theatrical productions, speaker rotations at podiums, or situations where a microphone may be passed between multiple users. In all other acoustic and electrical aspects, it delivers the same legendary performance as the standard SM58, with a tailored frequency response for vocal presence and a durable cardioid polar pattern that controls background noise and provides high gain before feedback.

The microphone retains the robust construction the SM58 is known for, including a built-in spherical wind and pop filter, a shock-mounted cartridge to minimize handling noise, and a rugged steel grille that can withstand rough use. The on/off switch is typically a sliding or push-button mechanism integrated into the microphone's body, designed for easy access and reliable operation. Like all SM58 models, it features a balanced, low-impedance output via a standard 3-pin XLR connector, ensuring compatibility with any professional sound system. This microphone requires no external power, operating purely as a passive dynamic transducer.

The SM58S offers the same trusted sonic character and roadworthiness as the original, with added operational flexibility. It is an ideal choice for venues, houses of worship, conference centers, and touring acts where the reliability and sound of an SM58 are desired, but where the practical need for a local mute function outweighs the preference for a switchless model.