LED (light emitting diode) cluster light set. Features an 8-function memory controller to set lights to various modes from constant to twinkle. Ideal for both indoor or outdoor use. Bulbs are cool to the touch and are virtually unbreakable. Wires will not tangle. Approximately 2 lights clustered together in 1/2 inch, followed by a space of 1/2 inch. 50,000 hour bulb life. UL (Underwriter's Laboratories) approved transformer.