Please let us know that you want 12v or 24v
Alarm is a to prevent or prevent some events caused by the consequences， to sound， light， pressure form to remind or warning that we should take some action of electronic products， mechanical alarm and an electronic alarm. With the progress of technology. Mechanical alarm more and more by the advanced electronic alarm replaced， often used in fault system， security， transportation， medical rescue， emergency relief， induction detection field， and social production are inseparable.