Instructions for use1. Use 5V for plug2. Pour half of the clean water into the aquarium before use, shake it a few times, and pour it out to clean the aquarium's impurities.3. Plug in the USB cable and pour clean water again. The surface of the water is about one centimeter away from the mouth of the bottle. Add 3-6 drops of detergent into the water.4. After the tentacles of the jellyfish are leveled, put them in the water and close the lid. Just turn on the switch.Note: When used for the first time, there will be a lot of bubbles on the surface of the jellyfish, which may cause the jellyfish to not float smoothly. After a period of time, after the bubbles disappear, it will swim normally or you can manually removethe bubbles on the surface of the jellyfish.Product size: 4.1*4.1*11.4 inch Jellyfish Lava Lamp,Night Light,Decorative Lights