Instantaneous fluctuation and harmonics filter, Pro.Fi Filter Light Single-phase Input-Output filter for the protection of household electrical appliances. It extends the operational life of your appliances by reducing the instantaneous fluctuations of the mains, which often damage or stop electrical and electronic devices or other sensitive equipment. In actual fact, Pro.Fi Filter Light makes indirect voltage stabilization. It reduces the instantaneous voltage fluctuations by eight times, as well as, reducing 50% of the harmonics of the network. Harmonics is often responsible for failures in electronic devices and appliances. It is placed locally on any household appliance. Power is 10 A or 25 A.