These cluster Christmas lights can be used to decorate your tree, being suitable for both indoor and outdoor use. Their ultra bright LED multi coloured cluster Christmas lights add a touch of sparkle to any festive display, coming with a choice of eight effects. The cluster Christmas light sequence choices are: 1) Combination 2) Sequential 3) Chaser Flashing 4) Twinkle Flashing 5) waves 6) Slow Glow 7) Steady On 8) Slow Fade. Distance from plug to first bulb 10m (Approx) Distance from first to last bulb 14m (Approx). Power supply mains transformer. Suitable for indoor or outdoor use. Please ensure that the transformer remains indoors and not in a wet and damp or excessively humid conditions. Benefits of LEDs: No heat, low power consumption, bulbs never need replacing.