Propeller
Koralia Nano Propeller

The
Koralia Nano is designed using a propeller to move the water. This allows for more efficient movement of the water in the aquarium space. The flow generated by this power head is much wider in volume than "jet" style powerheads.
Magnet Holder
Koralia Nano Magnetic Holder

The magnetic holder makes attaching this thing a breeze. You can attach it to the glass, on your overflow etc. The holder also has suction cups to help hold the unit in place. Here is a shot of the
Koralia Nano in my
Nano Cube. The whole unit is still only 3.5" long with the magnetic holder!