These are Voltage stabilizers/Voltage Regulators with Built-in
voltage transformer. These can be used for converting the voltage from 110V/120V to 220V/240V or vice versa. Or these can be used just for regulating 110V or 220/240V power. Also known as voltage regulator, voltage stabilizer, voltage stabilizers, line conditioners, dual voltage stabilizers, Ideal for use in countries where there is a lot of fluctuation in the power. Protects your equipment from damage due to power fluctuation.
TRANSFORMER PURCHASE GUIDE: Remember to leave at least a 100% slack for the voltage converter transformer. Televisions, Heating appliances, Laser printers, Halogen & fluorescent bulbs and power tools spike when you turn them on. For these products you need to buy a voltage converter transformer that is at least 3-4 times the items capacity.