Water Resistant. For Dogs and Puppies Above 12 Weeks. Adjustable One Size Fits All. Kills Fleas & Ticks, Repels Mosquitoes For Up To 6 Months. Prevents New Flea Infestation, Kills Adult Fleas Before They Lay Eggs. 1 Package Includes 2 Collars For Up To 12 Months Protection. Adams Flea and Tick Collars for Dogs and Puppies protect your pet from pests for up to 6 months each. These water-resistant, one-size-fits-all adjustable collars kill fleas and ticks and repel mosquitoes, no drops or sprays required. Kills fleas & ticks & repels mosquitoes for up to 6 months Water resistant Adjustable, one size fits all 2 collars provide up to 12 months protection Directions: Follow all package instructions for proper use. Not for puppies under 12 weeks.