Wholesale Dog Flea Collar: Hartz UltraGuard Reflecting Flea & Tick Collar for Dogs and Puppies kills fleas and deer ticks, that may carry the organism which causes Lyme Disease. For continuous protection under normal conditions replace the collar every 7 months. The collar kills fleas and ticks for 5 months and aids in their control an additional 2 months. It is water resistant and reflects direct light up to 300 feet. It fits up to 20 inch necks. Do not use on puppies less than 6 weeks of age. To activate collar, just hold the collar at each end, stretch, and it's ready to go. Don't take a chance with your pet's safety. Protect your dog during the out door seasons. Made in the USA. Each package contains 1 collar that weighs .85 oz. There are 6 collars to a case.