... : Unique and scientific design, perfect for operation.... CJB electronic siren series: Unique and scientific design, perfect for operation, safely ... light control in the panel. Design perfectly. Function: aux, yelp, hi-lo, wail-1,wail-2, siren, horn, super-siren. Yelp relay. ... Tool. Build in LID display, sound amplifying. HRB-P80 Siren