Moutain Web Sales Promotion Activity Dog No Bark Collar for Bark Control with 7 Levels Button Adjustable Sensitivity Control, for 15-120 Pounds Dogs, No Harm Warning Beep and Vibration 7 sensitivity levels (1-7) adjustable for the different size of dogs barking and specific environments through the "+" /"-" button Lightweight receiver, Unique bark terminator, Replaceable 6-volt Battery and Low battery consumption, Effective on a 15-120pounds dog 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 Adjustable nylon collar senses vibration in dog's throat during barking Pull out the insulating paper in the battery box before using.If you have any questions about the product.Please tell us through the email.