maintenance free.Just plug the saver into the wall socket cloest to the meter,one signal phase household require one power saver.

This Power Saver use a state of the electrical technology to actively monitor and improve the power factor of your household or office appliances.
In addition, the intelligent technology optimizes the voltage and current demands thus reducing the active power/ KwH demands and achieves up to 35% savings on your electricity bill. It reduces waveform distortions. It also acts as a voltage stabilizer by storing emery for up to 10 seconds and therefore suppliers the load with constant voltage during momentary power surges. As a result, this power saver prolongs lifespan of the electrical appliances.