NO BARKING OR WHINNING - The PetSafe Spray Anti Bark Dog Collar uses a spray stimulation to help stop nuisance barking or whining NEW TECHNOLOGY - The spray refill cartridges are convenient, quicker and easier to replace than leaky refill cans; no more guessing if the collar is full. Each cartridge provide 35 sprays. NO BATTERY REQUIRED - The PetSafe Spray Anti Bark Dog Collar is rechargeable, simply use the included USB charger when the rechargeable battery gets low EASY TO USE