Typically,one Professional Power Energy Saver can cover an area of about 500 square feet. And the more Professional Power Energy Saver you use, the better the effect.Using 3 to 5 Professional Power Energy Saver can even more than 50% of electricity. Features: Devicesarecapacitorbanks.Capacitorbanks provide capacitive load which is opposite of inductive load. When put in parallel with inductive load (like ceiling fans . pumps . ACs . etc) they improve The powerfactor thus taking less energy (from utility) for the same appliance (or same amount of work). Professional Power Energy Saverstores the electricityinside of it using a system of capacitors and theyrelease it in a smoother way to normal without the spikes. The systems also automaticallyremove carbon from the circuitwhich also encourages a smoother electrical flow.This means that we will have less power spikes. Moreover, Professional Power Energy Saver also reduce the energy consumption and thus the electricity bills. The amount of power saved by Professional Power Energy Saver depends on the number of appliances on the electrical circuit. Under special circumstances, such as humidity or when the appliance in use exceeds the limit,Professional Power Energy Saver takes at least a week to adapt itself fully to the circuit before it starts showing its peak performance. Another advantage of The power savers is not only that they provide abackup system in times of low currentbut also that it protects the household appliances. It is known that a sudden rise in the power can destroy the electrical appliance. Thus . the power saver not only protects the appliance but also increases its life. Moreover . they also reduce the energy consumption and thus the electricity bills. Specifications Rated voltage: 90v-250v Working temperature: -60-75 degree Rated frequency: 50Hz-60Hz Effective load: 15,000 W or 18,000 Package Includes: 1/2/5 X Professional Power Energy Saver