MULTIVET Gentle Spray Scentless Anti-Bark Spray Collar helps your pet to stop nuisance barking effectively. This scentless anti-bark spray collar is lightweight and comfortable; plus, one size fits all breeds. Each bark triggers a harmless spray that conditions the dog to stop barking. It has been clinically proven twice as effective as shock.The package includes: adjustable nylon collar anti-bark device 6-volt Alkaline Battery scentless spray refill detailed instructions