This string has 100 warm white/bright white lights. Every 10th light is bright white and flashes quickly creating a sparkling effect to your Christmas display. These lights all come with a transformer, however, if you wish to put 3 strings together you can do so and run them off the one transformer. (Each string can be connected into the end of the other string).
These lights are suitable for both indoor/outdoor use, but remember to always protect the transformer from weather.