by Animal Behaviour Systems, Inc. 

Humane - no electric shock! Controls nuisance barking using citronella spray. Each time your dog barks, the bark-sensing unit releases a brisk citronella spray in front of the dog's snout. Your dog hears it, sees its, feels it and most importantly, smells it! Through this harmless conditioned response, ABS discourages barking. The citronella spray is safe for dogs, people and the environment. Research shows that the ABS will reduce nuisance barking in 89% of the cases when used properly according to instructions provided by manufacturer. Each kit contains an Anti-Bark device, adjustable collar, can of citronella, batteries and detailed instructions.