Wail, Yelp, Priority, Manual, and Air Horn are all standard on the MS4000. Two rocker switches control all the siren functions. One switch controls AIR HORN/MANUAL, and the other controls WAIL/YELP. The AIR HORN/MANUAL switch rests in the neutral (center) position and activates a function when momentarily placed into the up or down position. The WAIL/YELP switch is a three-position switch with the center position being neutral.

A new, built-in intersection clearing feature adds effective traffic management capability at potentially hazardous crossings. When the MS4000 is activated and in the WAIL position, depressing the momentary switch to the MANUAL position produces an eight-second Yelp tone. When the MS4000 is activated and in the YELP position, depressing the momentary switch to the MANUAL position produces an eight-second Priority tone.

The MS4000U is designed especially for the undercover officer and volunteer firefighters. Siren functions are activated in the same manner as the standard MS4000, but from switches mounted onto a small, remote switch panel.