If these toys happen to be powered by USB, well then, all the more fun to have. The USB Mini Desktop Aquarium is the home to two life-like tropical fish. A small motor generates a current in the water, allowing the fish to gently swim about the tank. The aquarium is equipped with a high-intensity blue LED that illuminates the tank in dark environment. Both motor and LED can be independently switched off. The LED and the water-current motor can be powered by USB connection or batteries.