The Electricity Saving Spike Buster Set of 6 by Power Saver is designed to help you save energy by optimizing electrical power consumption. These spike busters are specifically made for use in the United States with an input voltage of 120V and an output voltage of 120V. The set includes 6 units, allowing you to use them throughout your home to help reduce energy spikes and improve overall electrical efficiency. Whether you want to save money on your energy bill or reduce your carbon footprint, this set is a convenient and effective solution.