When your dog barks, the Dogtek NoBark Spray delivers a short spray of harmless citronella mist towards the dog's lower jaw. Completely harmless and painless, the citronella anti-bark collar is scientifically proven to be the most effective on the market. The Dogtek NoBark Spray collar is automatic and does not require human involvement. Within a short period of training time, the dog begins to associate the citronella spray correction with their bad barking habits further reducing your dog's desire to excessively bark.