This North American style,Multipurpose push button switch and clear Mini Stopper II cover are designed to compliment fire alarm systems indoors. The button incorporates a unique, patented design and the clear cover helps prevent accidental activation. he highly advanced Stopper Station push button unit is ADA Compliant and UL Listed to U.S. and Canadian safety standards. Operation of the octagon button includes Push-to-Activate and Key-to-Reset. The unit incorporates quality features throughout, including raised lettering molded into its polycarbonate faceplate. he Mini Stopper II offers excellent protection against physical damage both accidental or intentional. Consists of a clear, super tough polycarbonate cover, frame and alarm. When lifted to gain access to the protected unit, its optional battery powered alarm will sound. Note: Per UL Listing,This model available with inchFIRE inch label only.