Listed is the 130 volt version but I have 120 volt and it's fine. When I check the manufacturer's website I don't even see a 130 volt version available. These are fairly good quality C7s with carefully taut threads that are well centered and will not sag after time. The 4w size is best for window candles due to the lower light output (it comes pretty close to what a candle can actually put out) and the light is quite yellow which is desirable, again more like a flame. The light emitted by 4C7 and 7C7 from different manufacturers varies greatly in brightness and color temperature. I have tried almost all of them and they are very good.
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