Not 100% sure but I think they are "universal" so anything between 100 and 250VAC.....
[EDIT]
I was right. Here is the FAQ from one of the ebay ads:
FAQ:
Q: Is this a glass neon light or a plastic tube light?
A: This is a true gas-filled glass neon light sign! Not a plastic tube light!
Q: Do you send to other country? What is the postage?
A: Free shipping to all countries.
Q: Can I used it in other country? (Input is 110 or 240 voltage).
A: Suitable for any country. Item is American type dual flat plug, If you used it in other countries, we will add a power adaptor for you.
Q: When will shipped my order if I buy it now?
A: All items will be shipped within 1 business day after received of payment (except Saturday ).
Q: When shall I receive my orders?
A: It takes about 10-14 business days depending on your location.
Q: What kind of Shipping Method?
A: All items will usually shipped by HongKong Post Office.
Q: If I want faster shipping?
A: If you want choose faster shipping(EMS), Need to add extra shipping cost of $9.00 for faster shipping(expect to arrive in 5-10 business days).
Q: Is there any preferential policy if I buy more signs?
A: If you buy 2 signs in my store,will free shipped by faster shipping.(EMS,expect to arrive in 5-10 business days). No need to pay extra cost. All item will make into a package to shipped.
Q: If damaged in transit?
A: If damaged in transit, will free shiped a new sign for you ASAP. Not just a light tube, but a brand new neon light sign.Item is guaranteed for lifetime.
Q: If not satisfied with your products and service?
A: If you are not satisfied with our products and service, A no-quibble, 100% money-back guarantee.Every satisfied customer is the best advertisement. Please feel free to contact us if you have any question. we reply to all inquiries within 12 hours.
Q: Can you make any custom sign? How long will it take?
A: Welcome wholesale and custom sign. We can make your design within 2-3 business days. Tailor made design is our specialty.We have plenty other designs.
