Something even more amusing-- by a different seller, I came across another "radiation reducing" sticker.
Buried deep within the product description, the company states that a difference is not detectable by an EMF meter-- that you need a voltage meter to check if it is working. Direct Quote: "You can tell that they are working because they will show up as "blocking" on a voltage meter, but not on an EMF meter."
Having a slight interest in electrical design, I decided to investigate further.
The company put a simple resistor inside of the sticker, in order to fool people into thinking it is "working." Even though the sticker claims to reduce the amount of radiation, it really is a (probably 1/5 cent) resistor and a piece of adhesive. In reality, the only "blocking" this sticker would do would be to an electrical current, if a small amount was applied.
And yes, on this sticker, the reviews are equally as amazing. But to get this amazing product, one must pay $50-70 to get a pack of 10 stickers. At least it comes with a free EMF "neutralizer" button.