An automatic voltage regulator (AVR) is a device that stabilizes the voltage of the power supply to a load. Its main function is to protect electrical appliances from damage caused by voltage fluctuations, such as sags, brownouts, and surges.
Key features of this specific model, as indicated on the box, include:
Model: ST-1500A
Output: 110V/220V at 50/60Hz
Capacity: 1.5KVA
Manufacturer: Star International Corporation, a product of AIRLITE Group