The Laguna PowerGlo LED Mini Pond Kit includes two submersible LED light units (40 bright LEDs each), a 12-volt transformer and an on/off light sensor. The LED lights are extremely compact and can be used almost anywhere, in or out of the water, to produce stunning lighting effects. The use of LED technology results in a longer lasting and a more energy efficient light. LED lights provide several benefits over regular bulbs: they"re more energy efficient, they consume less wattage, and they last longer. Laguna PowerGlo LED Mini Pond Kit contains lights that are pre-wired to make installation easy; just simply place in the desired location and connect to the electrical outlet.