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Every geek likes to add new and interesting toys to their desktop. And 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. The package comes complete with the tank, two fish, and USB cable. Operation is simple! Just add water to the tank, connect the cable to your computer, and enjoy the aquarium.
Source:Link