The transformer plugs into a standard 110 volt outlet. The operating voltage is from 95 to 130 volts. This allows the box to perform well in areas where there are frequent brownouts. There are either 16 or 32 terminals in the box. Any terminal can be an output or an input, depending on what type of module is associated with it.
Black modules are outputs to valves or relays.
Each output terminal in the satellite box can support up to a 2 amp load. Most valves are between 0.5 and 0.2 amps. The output terminal is wired to one side of the circuit. The other side is ground or L2. Multiple L2 terminals are provided for convenience.