SAFE AND EFFECTIVE COLLAR: ShengKou collars include the most effective all-natural formula used by leading brands in the pet care industry, We use citronella and other safe formulas, Our flea and tick collar can effectively help pets get rid of internal & external parasites and fleas, ticks, and other pests. We have specially treated the garlic essential oil so that it will not cause additional irritating reactions in pets. LONG-TERM PROTECTION: The Shengkou flea and tick Collar’s innovative sustained release technology repels fleas, ticks, and other pests for 12 months with one easy-to-use, Natural citronella smell, non-greasy flea collar. UPGRADE DESIGN – The flea and tick collar adds a emergency breaking point design that allows your dog and cat to walk and play in the rain or wet snow without worrying about their Safety and the effectiveness of the collar. PERFECT SIZE: This collar is suitable for cats older than 10 weeks and with a neck circumference of 13.8 in or less. Simply adjust the collar to fit the length you need and cut off any remaining length. WATER RESISTANT COLLAR: ShengKou Collar allows your beloved cats full protection at any time or places even in the rain, swimming or bathing. The collar will not need to be removed from your cat's neck until you want to replace it. However, immersing in water for a long time will shorten the protection time. Responsible customer service team, if the product has any problems in the process of use, please contact us in time.