I do recommend that you be very cautious for several reasons:

The offshore vendor may be (usually is) offering product(s) that are not approved for use or sale in the USA.

• Products from these vendors are sometimes stopped by US Customs and or the FDA and are typically rejected and you are out of cash!
  • If there are are any warranty issues, returning products for testing/repair can be very very expensive!
• If there are any legal issues then dealing with foreign vendors can be a problem.
• If you are foolhardy enough to purchase overseas then always use a credit card so that if necessary you can try to get any payment or part of a payment reversed by your credit card company.
• Some of these companies say “No Prescription Needed” – This should be a red-flag to you! All UV Ultraviolet systems require a prescription in the USA. If you purchase a non-FDA certified product then you may be in breech of sevreal laws.
• Just because the lamps used are possibly FDA Certified, this does not mean that the system or final product is.
• Check the voltage and frequency. Here in the USA we use 115V 60 Hz. A lot of offshore products operate at 220V/50Hz

There are several vendors/manufacturers here in the USA and we all sell devices that are 510K Certified by the FDA.