Here's the product description: The PetSafe Spray Refill Citronella 3-Pack (UPC: 729849163713) provides a convenient and mess-free way to keep your PetSafe spray bark collar or remote training collar working effectively. This 3-pack of refill cartridges ensures you have an ample supply to manage your dog's nuisance barking or reinforce training commands. These replacement cartridges are incredibly easy to use. Simply remove the empty cartridge from your PetSafe spray collar and replace it with a new one. The citronella scent is designed to be a harmless yet effective distraction for your dog, helping to interrupt unwanted behaviors. The spray is directed towards the snout and is designed to deter unwanted behavior. The PetSafe Spray Refill cartridges are also designed with the environment in mind. They are 100% recyclable, making them a responsible choice for pet owners. These refills are specifically designed for use with PetSafe Spray Bark Collars (PBC00-16368) and PetSafe Spray Remote Trainers (PDT00-16395). Please note that these refills are not compatible with GentleSpray, Elite Big Dog, or Little Dog Spray Bark Collars or Trainers. Each cartridge contains a citronella scent, which is designed to be harmless to your dog. The cartridges are easy to replace with no mess. Key Features: * 3-pack of citronella spray refills * Easy, no-mess replacement * Harmless citronella scent to deter barking * 100% recyclable cartridges * Compatible with PetSafe Spray Bark and Remote Training Collars ERROR