12 MONTHS POWERFUL PROTECTION: Activate II Flea Collar for Dogs provides up to twelve (12) months of flea and tick prevention for dogs that kills fleas, flea eggs, ticks, chewing lice, and repels mosquitoes and other biting flies for up to six (6) months with each collar. Two (2) collars are included in every package FAST ACTING WITH NO BITING REQUIRED: Activate II Flea Collar REPELS and KILLS fleas and ticks on contact, without your furry friend needing to be exposed to bites. Other oral flea meds, pills, and chews require that your pet is bitten by a pest before the medicine can work, exposing your dog to potential flea borne illnesses like Lyme disease VET APPROVED, WATERPROOF FORMULA: Activate II Flea Collar for Dogs is fully waterproof and uses the safe and effective active ingredients Deltamethrin and Pyriproxyfen. Activate II for Dogs starts to kill fleas and ticks within 24 hours, and instantly begins repelling mosquitoes and other biting flies. Every dog deserves the best protection - Activate II helps you provide veterinarian level of care at an affordable and fair price.