ac voltage regulator
An ac voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. All modern electronic ac voltage regulators operate by comparing the actual output voltage to some internal fixed reference voltage. Any difference is amplified and used to control the regulation element. ac voltage regulator are also known as regulator, voltage stabilizer, voltage stabilizers, dual voltage stabilizers, dual voltage converters. Ideal for use in countries where there is a lot of fluctuation in the power. Protects your equipment from damage due to power fluctuation.

How to find correct ac voltage regulators
To determine the right voltage converter for your appliance, first find out the voltage (110 or 220 Volt AC) and wattage rating (watts or amps) information on the back or bottom of the appliance or from instruction book of an appliance. If no watts are shown and only amps are shown, multiply the volts (input AC) by the amps to find the watts.

For example,
Volts (AC input) x Amps(amperage) = Watts (Wattage)
110V x 0.8A = 88W

Note: voltage converters or transformers or regulators do not change cycles (50hz or 60hz). Our transformers do not work for two phase American 220V volt to convert to 110V.http://www.yiyenele.com/products/proclass_425/