TetraPond Triple Light Set can be used outside the pond or underwater. Complete set includes three low-voltage 10-watt lights, 20' cable, and transformer. Light sensor automatically turns on at dusk and shuts off at dawn (built into the transformer). 12-volt/10 watt with 120-volt power supply. Consists of 9 lens - 3 red, 3 yellow, and 3 blue.