I'm giving it two stars only because the device itself appears to be well made and easy to use. Was very disappointed with the performance of this theft protection roller stamp. I tried it on a prescription label, but the ink fades away and the print isn't blacked out. Tried it on a piece of mail that was regular paper (not coated). This time the ink didn't fade away, but when dried you could read the label through the ink. I went over it multiple times - rolling from different directions - same result. When the ink dried and I held the paper so the light would hit it, the label was clearly readable. I plan on returning this to Walmart.