Norstar DAVR-2000 110/120 to 220/240 or 220/240 to 110/120 Step UP and Down Voltage transformer and Automatic Voltage Regulator . … - Digital display meters are more accurate stable and easy to read the voltage status at a glance. - this unit comes with individual circuti breakers for both input and output voltage along with dual swiches which ensures double protection. - This unit has a built-in new generation CPU which ensures consistency and stability to the AVR unit.