Size:10 x 10 x 29cm Power supply:4 AAA battery(Not Include),or USB charging . When you use it for the first time, you can add a little (just a little) dish soap to the water, this will lubricate the jellyfish, which will make the jellyfish more active in the water. Or you can wipe the inside of the jellyfish with some washing-up liquid, which can also serve as a lubricant. Realistic Ocean Background : The background is an underwater world. Use this jellyfish night light and it is more realistic and feels like you are living in the ocean. Suit for : These mood lights are suitable for living room background decoration, office table lamp, bedroom night light, desktop aquarium lamp. The animated jellyfish lamp makes it fun to learn about the variety of sea life. Jellyfish flows, slight color changes, a really beautiful night lamp. The night effect is more obvious, realistic and captivating. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.