The PetSafe® Anti-Bark Spray Collar™ Basic Spray Bark Control is simple to operate. When the sound of your dog's bark triggers the microphone, a burst of spray is emitted which dogs find unpleasant. While not harmful, it is a sufficient deterrent to excessive barking. Features For dogs 2.7 kg and up Fits neck sizes up to 60 cm Gentle yet effective spray stimulation Microphone detects bark Splash proof Uses 1 6-volt battery (included) Battery usually lasts 2 weeks Related Part Numbers: KIT11122, KIT11123 System Includes Spray Bark Control with ON/OFF Switch Adjustable Nylon Collar One can of stain-free Citronella Spray 6-volt Alkaline Battery (RFA-18-11) Operating Guide