1. Provides 8 months of continuous flea and tick prevention2. They work effectively together to maintain a sustained release by dispersing the ingredients at the point of immediate u with other skin surfaces.3. Veterinarian-recommended prevention of fleas and ticks for dogs in a comfortable, odorless and non-greasy collar; No messy monthly treatments are required4. Start expelling and getting rid of fleas within 24 hours of first use5. Flea and tick collars for large dogs also help to heal and control mange and get rid of liceSpecification:Collar size: large dog: 1*70cm. Puppy/Cat: 1*38cmIron Box Size: Height 3.8cm * Diameter 12cm,Product Weight: Large Dog: 40g Puppy: 13g Cat 13gBox Weight: Large Dog: 122g Small, Cat: 95gProduct List:1*Pet Collar Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin