The benefit to having a Power Backup System in your home overseas is that you can continue working on your computer or laptop for a short time even during a neighborhood power outage. The way the Power Backup works is quite simple: Connect the Power Backup to your wall outlet and leave it there to charge. Then, when a power outage happens in your neighborhood, just plug in your computer or laptop or tv and cable box into the Power Backup and you'll get power for a short amount of time (usually anywhere between 15-45 minutes, depending upon how much power your appliance or electronic takes from it). It's important to note that these Power Backup Systems are not Converters or Voltage Stabilizers; Power Backup Systems do not converter voltage and are only able to be used in foreign 220/240 Voltage countries overseas. So please keep in mind that these items will not operate in the USA.