The PetSafe Spray Bark Dog Collar is designed to help stop nuisance barking and whining with spray technology. This collar is great for outdoor use in the park, or in the house at night when you want to sleep. The sound and vibration of your dog's bark triggers the sensor, emitting a burst of citronella spray; helping to stop the unwanted behaviour. The spray cartridges are convenient to replace and there are no batteries required. Simply recharge the bark collar with the included charger. The adjustable collar is designed to fit dogs 3.6 kg and up with necks up to 68 cm in circumference. The PetSafe Spray Bark Dog Collar will help you enjoy time outdoor and indoor with your dog without the nuisance barking.