Petsafe, spray bark collar, designed to help stop nuisance barking & whining with a burst of spray, sound & vibration of your dog's bark triggers a sensor on the collar, emitting a burst of spray to help stop the unwanted behavior, includes both a citronella & an unscented spray refill cartridge, recyclable refill cartridges are convenient to replace with no mess, collar is rechargeable, no batteries required, designed to fit dogs 8 lb & up with necks up to 27" in circumference, refill cartridges tv #261-018 & tv #261-019.