... 2) Models: MS-190, MS-290, MS-390 motor siren motor sirenDetailed Product DescriptionElectronic siren series: Unique and scientific design, perfect for operation, safely ... . Function: aux, yelp, hi-lo, wail-1,wail-2, siren, horn, super-siren. Yelp relay. Tool. Build in LID display, sound amplifying ...