3 brightness mode choices: Click the ON/OFF button to switch between Dim (indoor, 8 LEDs), Bright (outdoor, 20 LEDs), Super Bright (28 LEDs), and OFF modes. Multiple power supply options: In addition to charging the light with the included USB cable, this umbrella light can also be powered by 4 AA batteries (not included). Easy installation: Cordless design with a flexible built-in clamp, automatically adjustable, no tools requiredsimply clip it onto your umbrella. Premium lamp: Made of high-quality, durable ABS material with 28 energy-saving LEDs. Use for direct lighting with the front face down or indirect lighting with the front face up. Enjoy your free time: When the sunlight fades, continue your dinner, read a book, talk with friends, or spend time with family at the beach, on your balcony, or by the swimming pool.