An automatic voltage regulator (AVR) is an electronic device that maintains a constant voltage level to electrical equipment on the same load. The AVR regulates voltage variations to deliver constant, reliable power supply. Also known as an Automatic Voltage Regulator (AVR) or Voltage Regulator (VR), an Automatic Voltage Stabiliser (AVS) stabilises the mains power supply voltage to a load. It is a feature of Line Interactive uninterruptible power supplies and provides protection from power problems such as sags, brownouts and surges. Key Feature: Designed to transform 220 volts into 110 volts up to 5000 watts It is applicable for areas with large fluctuations of electric network voltages like Africa Will Not Work In The United States or Any 110 Volts Country Does Not Come With Electrical Cord Has To Be onnected Directly To The Electrical Panel Exclusive For Use In 220 Volts Countries To Convert And Transform 220 Volts In 110 Volts Specification: Brand: Royalty Japan technology I.C motor powered Power booster with step down micro processor contorolled DVR -5000 watt