Smart Bark Control Dog Collar for Small and Large Dogs. Electronic Device to Stop Barking habit, from PetTechniques, Offers Humane Adjustable Harmless Cure using 7 Progressive levels of sound/shock Controls, Regulates Barking, Help Your Dog Cure Fast Excellent use of technology to overcome the behavioral challenges of our pet friends & deter barking 7 gradual correction levels of intensity create a pattern that dog recognizes easily & stop barking Very easy to operate and apply. Testing tool helps check and see intensity levels of tone and shock. SAFETY: Unit turns off for 1 minute after 7th level. On 30 seconds silence unit reset to level 1 (mild) Detailed User's Manual and Video on our website will help you understand and apply Anti Bark Collar