DESCRIPTION The PetSafe Spray Refill cartridges are easy to replace with no mess. Simply remove the empty cartridge and replace with the new one. The citronella scent is harmless to your dog and is meant to act as a distraction to help stop nuisance barking. The PetSafe Spray Refill cartridge is 100% recyclable and safe for you and your dog! Features: Compatible Collars – The PetSafe Spray Refill – Citronella is for use with the PetSafe Spray Bark and Training collars; it is NOT compatible with the PetSafe GentleSpray, Elite Big Dog and Little Dog Spray Bark Collars or Elite Big Dog and Little Dog Spray Trainers Easy-to-Replace – The refill cartridges are easy to replace; simply remove the empty cartridge and replace with the new refill cartridge 100% Recyclable – The disposable PetSafe Spray Refill cartridges are 100% recyclable Includes: 3 Citronella Refill Cartridges Intended Pet(s): Dogs Materials:100$ Recyclable Material Compatible With: Compatible Collars -The PetSafe- Spray Refill – Citronella is for use with the PetSafe Spray Bark and Training collars. It is NOT compatible with the PetSafe GentleSpray, Elite Big Dog and Little Dog Spray Bark Collars or Elite Big Dog and Little Dog Spray Trainers Caution: CONTENTS UNDER PRESSURE. Container may explode if heated. Do not expose to heat or store at temperatures above 120 degrees F. Do not puncture or incinerate container. Use with adequate ventilation. KEEP OUT OF REACH OF CHILDREN.