The safe and humane way to deter excessive barking. This unique dog collar is equipped with a battery operated, electronic bark sensing unit. The adjustable collar releases an all natural citronella spray when your dog barks. The harmless citrus smell and quick action of the spray mist startles and confuses the pet's highly developed olfactory sense, causing him to stop barking. This method is reported by the manufacturer to be twice as effective as electric shock. Unit includes spray control receiver and collar weighs approximately 2.5 oz. and can be worn by dogs 6 lbs. and over. 3 oz. citronella spray refill additional refills sold separately 6 Volt Alkaline Battery Detailed operations manual Manufacturer provides a lifetime warranty. View Instruction Guide Made in the USA. This product ships by UPS ground only. We are unable to deliver to P.O. boxes, APOFPO addresses, AlaskaHawaii or Canada.