From the manufacturer

Kills and repels fleas and ticks by contact so pests don’t have to bite your cat to die.

Starts to kill and repel fleas within 24 hours of initial application and kills reinfesting ticks in as few as six hours.

Seresto is the #1 veterinarian recommended flea & tick collar.*

None

Be sure to attach the collar tight enough to ensure the collar is always coming into contact with your cat’s skin and hair.

Use the 2-finger rule: insert the end of the collar through the buckle, then adjust the collar so that it is possible to hold two fingers comfortably between the collar and the neck.

Pull excess collar through the loop(s) and cut off extra collar, unless it is on a growing kitten. See package insert for details.

Seresto kills existing fleas on cats within 24 hours after application. After those 24 hours, new fleas are killed within 2 hours.

It is crucial that pet owners purchase real and genuine Seresto products from authorized and trusted retailers. Counterfeit collars and their packaging look very similar to the actual product. Be sure the collar does not have a greasy feel or an odor.

There is no expiration date required on the packaging.

The active ingredients in Seresto collars are Imidacloprid and Flumethrin: Imidacloprid to help protect against fleas and Flumethrin to help protect against ticks. No other product has this combination of ingredients.

Product Description

Give your cat long-lasting protection against fleas and ticks with a Seresto Cat flea and tick collar. Unlike other flea and tick protection, Seresto Cat flea and tick collars kill and repel fleas for eight continuous months. Seresto Cat flea and tick collars are recommended by veterinarians, stocked by 8,000 vet clinics* and trusted by pet owners for nearly a decade.