THIS LISTING IS CREATED BY Trust&Buy, IF YOU WANT TO BUY ITEM SAME AS THE PICTURE AND THE DESCRIPTION, PLEASE BUY FROM Trust&Buy. * The three high simulation silicone jellyfishes display a variety of swimming methods * Power Supply: 3 x AA batteries (not included) or USB powered * Color changing automatically. With energy saving functions. * This USB jellyfish tank uses underwater background paper for a better visual effect . Size: 18 * 10 * 23 CM