The package comes with 2 plug-ins, but only 1 of mine worked.
Each light has its own power switch, or the connected group can be controlled by ingle switch on wall plug cord. I have upto 4 units daisy chained and once setup seems to work without problem. Very bright, not hurtful to the eyes.
Good value and decently made product. Works as advertised. Also, noticing better plant growth. It seems to work farily well and my sunroom full of plants are doing well.