All dogs bark, but some don't know when to stop. If your dog's barking is becoming a nuisance, this may be the solution you're looking for. 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 gentle yet effective burst of spray is emitted which dogs find unpleasant. While not harmful, it is a sufficient deterrent to excessive barking. It is designed for dogs 2.7 kg and up and fits neck sizes up to 66 cm. Splash proof it uses 1 x 6 Volt battery (included). Battery usually lasts 2 weeks and the collar includes a low battery indicator. 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) and an operating guide.