TWO KINDS OF POWER SUPPLY AND LONG LIFE: Powered by 3 AA batteries (not included); or use the USB cable we provide. The LED light has a long lifespan of over 30,000 hours, three to four times longer than normal halogen lights. APPLICATIONS: This jellyfish tank light has the soft, gentle light to ease your mind. Very good for bedroom, home, bars, cafes, restaurants, wedding, party. It is also the perfect lighting tool at night. May your night be full of brightness. This is a very good night light for children. ENERGY SAVING DESIGN: It will automatically shut down after working four hours, can save energy greatly. You need to press the ON/OFF button to make this jellyfish tank light restart. EASY TO USE AND COLORFUL MUTATION LIGHT: There are 2 buttons on the top of the lid. Press ON/OFF button, it is automatic color changing mode. The light alternates with time; Further press the LIGHT button, you can manually change the LED display color. The color changes cyclically as follows: Red , Blue , Green , Red, Blue , Red, Green ,Colorful automatic change. QUIET AND PERFECT GIFT:function well, no noise, db40. The beautiful jellyfish floats gently in this realistic aquarium. Create a calming atmosphere, realistic peaceful movements that can help you find peace of mind. It is the perfect gift for children to recognize the marine world.