Optical ports: For connecting to fiber optic cables, allowing communication with other network elements. Power supply: To provide electricity to the switch box. Control circuitry: For managing the switching functions and configuration. Applied as household bathtub,small bath, swimming pool,SPA, foot tub, massage chair and other water massage products with power drive and sinal control. The main control functions include: massage, drainage,colorful lamps. The function of the control box: 120V, 60Hz,  3bit touch button: 1) Control: power,2) Control: 1 magnetic jet pump  3) Control: a led light. Now comes with premium mechanical air switch internals. These are a much higher quality than older style switches used by other models and brands. Please do not compare with the cheaper alternatives.   Also replaces: Dega Airswitch Controllers Pool rite,SpaceAge branded air switches Also replaces all obsolete Dega Research Heavy Duty Air Switch Controllers.  Do not connect induction motors such as pumps or major damage will result. May not work on blowers with a circuit board.