1. It needs connect lines in four places, but these can't be controlled separately in independent mode, and can only be controlled in unified mode. 2. There is a 120V power plug inside, which can be plugged into the wall power socket. 3. There are output connection terminals on the transformer, because it is AC voltage, so there is no difference between positive and negative poles. 4. There is no polarity. 5. If the temperature of transformer is very low, Class B insulation material can be used.
By vevor