Made by Bayer (who makes Advantage and Advocate). Seresto is an innovative product that is not the same as the cheap flea collars in supermarkets. Instead of just repelling flea and ticks around the neck area, the Seresto collar will slowly release its active ingredinet onto the coat and then blood stream over 8 months, killing any fleas and eggs (as well as ticks for 4 months). Features Not just repel, but kills fleas and ticks Long 8-month cycle for flea protection (4 months for ticks), no need for monthly drops or tablets reminders Collar is water proof (althought excessive exposure to water, such as swimming, will reduce its effectiveness) Easy to use collar, no need to hide tablets in treats or chase your dog around for drops