Littelfuse Alarms and Accessories are designed for universal applications within harsh environments. Their features are designed for ease-of-installation and extended product lifecycle. Equipped with electromechanical buzzers that are designed for long-life, these products are designed to instantly indicate state changes to end users. Products will function with a variety of Cole Hersee and Littelfuse branded switches. Many uses such as, door ajar warning, bus driver alert, low air pressure, temperature, etc. Works with any temperature, pressure, door or momentary switch.