If it sounds too good to be true then you're right. I purchased two seresto collars. The packaging inside was different then the canisters I had previously gotten. There was no serial number on the caller, and the clips for the collar were in a Ziploc bag instead of a cellophane packet. I called bear directly and confirmed that this was not a legitimate Bayer product. My biggest tip-off was that the package came from China. Pets glad would not answer any emails. I filed a complaint with Bayer, I filed a complaint with PayPal, my money was refunded within 24 hours. Be very careful, counterfeit products can kill your pet.