Oternal Electronic No Bark Control Dog Training Collar with 7 Levels Button Adjustable Sensitivity Control, Black Nylon Collar, an and Effective Pet Training Device for 8-120 Pounds Dog, Keeping a Quiet Environment At Home/Indoor (2015 Upgraded-improve Sensitivity Setting, Appearance, Battery Life, Etc.) High-quality Electronic Anti-Bark Dog Collar and Sends harmless warning sound and shock to the dog whenever it barks The stimulations repeat through 7 correction levels, the intensity gradually increases until the dog stops for thirty seconds. If the continuous stimulus reaches the 7 levels, then the Collar will stop working for 1 minutes to protect the dog 7 sensitivity levels (1-7) adjustable for the different size of dogs barking through the Lightweight receiver, Unique bark terminator, Replaceable 6-volt Battery and Low battery consumption, Effective on a 8-120pounds dog NOTE: The seller