This device is a Fully Automatic AC Voltage Regulator (specifically a servo-motor controlled stabilizer). Its main purpose is to take an unstable incoming electrical voltage—which might be fluctuating too high or too low—and stabilize it to a safe, constant level (either 110V or 220V) to protect sensitive electronic appliances from damage. Here is a breakdown of its key features and how to read the front panel: 1. Specifications & Capacity (⁠RATING⁠ table) The maximum amount of power this device can handle depends entirely on your wall's incoming voltage: If your wall outlet is 160V–240V: The regulator can handle a maximum capacity of 500VA (roughly 400–450 watts). If your wall outlet is 50V–130V: The maximum capacity drops to 250VA (roughly 200 watts).