--6 lengths optional: RGB LED fairy lights Christmas tree has 2m 20LEDs, 5m 50LEDs, 10m 100LEDs, 15m 150LEDs, 20m 200LEDs, 30m 300LEDs for you to choose --you can decorate the Christmas tree, garden shelves, curtains to choose from --The light can be dimmed through the APP, the brightness is adjusta..