I checked with Bayer, the manufacturer of the collars after I got mine. They had me check for several numbers on the packaging. One that they asked for wasn't even on the packages. At that point Bayer advised me NOT to use them because even if they DID manufacture the collars... they couldn't even confirm if they were made by Bayer... they are not intended for use in the United States. I finally got most of my money refunded, but it took almost 2 months, and they did not refund an international fee that showed up on my bank statement the day after the original charge posted. I contacted them about that and they said that was a charge from my bank for ordering something from outside the US. Nothing on their website indicates they are not in the States or there will be an international fee added after the purchase. I did contact my bank and they told me they did not collect a fee for the purchase and Pet Care Supplies had added that on. The fee was only an additional $4.00 plus change so I gave up fighting with Pet Care Supplies but I will never order from them again, and I would advise anyone not to do business with them

BUYER BEWARE. This company is operated outside of the US and their products are ALL knockoffs made at pennies on the dollar... even though it appears cheaper... that's because it's fake.