The PetSafe Spray Bark Dog Collar is designed to help stop nuisance barking and whining with spray technology. It is great for use outdoor in the park with your dog, 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. Key Features Light Spray - The PetSafe Spray Bark Collar uses a light citronella or unscented spray to kindly remind your dog when it’s time to be quiet. Spray Refill Cartridge - New recyclable spray refill cartridges are easy-to-use and simple to replace. No Accidental Sprays - Advanced bark detection technology ensures your dog will never receive an accidental spray, even when other dogs bark. Fits Most Dogs - The Spray Bark Collar is designed to fit any dog 3.6 kg and up. Rechargeable - Every Spray Bark Collar comes with a USB charger for recharging as well as an average battery life of 40 hours depending on use. Water Resistant - The Spray Bark Collar is water resistant, so you can take it practically anywhere. Features For indoor or outdoor use For dogs 3.6 kg and up Fits neck sizes up to 68.6 cm Gentle yet effective spray stimulation Sound & vibration sensors - only your dog's bark causes stimulation Automatic Safety Shut-Off Water resistant Uses a rechargeable battery (built-in; non-replaceable) Battery usually lasts 40-50 hours Battery recharges in 4-5 hours Low battery indicator System Includes Spray Bark Collar USB Charger Spray Cartridges