Perfect combination of quiet operation, small size, high performance, quality components and low running cost. Best performance ratio to size in the market. Magnetic mount. 360 degrees flow adjustable. Pure ceramic bearings minimize noise and extend life. Pre-lubricated, self-cleaning impeller. Silicone cord protection. 3.5W for 3500 liters per hour. Suitable for marine tanks upto 250 liters or freshwater tanks upto 400 liters.