The Push Button Station isn't suitable for US Buyers. The Push Button Station is mainly used in industrial control circuit. The AC-15 Push Button Station consist of three separate switches. One is a green light push button self lock switch with the design of 1NO ; 1NC contact and 6 screw terminals, one is 3 position key push button switch, and the third is a red self lock mushroom push button switch designed with 4 screw terminals, 1NC 1NO contact and you can reset the switch by rotating the button.