1.3 Brightness Mode -- Press once to display 4 dimly lit LEDs, press twice to display 24 lit LEDs, or press three times to display 28 super bright LEDs.Meets your needs for different brightness levels in different situations. 2.Convenient -- No additional tools required, easily clips onto the umbrella using the built-in automatic adjustable strong clamp, suitable for poles with a diameter of approximately 1.15inch to 2inch. 3.Energy-saving and bright -- Equipped with 28 energy-saving LED bulbs, LED is energy-efficient and environmentally friendly. 4.Multiple functions -- suitable for camping, barbecuing, playing cards, or relaxing in a recliner with your family or friends at night. 5.Power Source -- Requires 4 AA batteries, not included, easily available at regular stores. Easy to carry, ready for battery backup.