Automatic Voltage Regulator (STAC Automatic Voltage Regulator - AVR) Auto Stac 1000W Fully Automatic AC Voltage Regulator Made in Japan Type STAC-1000VA Operates with Servo Motor system Total capacity 1000VA Includes 110V and 220V outputs With input voltage selection 110/220V Made in Japan Its function is to regulate and stabilize electricity voltage to protect devices from voltage fluctuations. Price 250 Riyals Slightly negotiable