Super No Bark Collar for Bark Control with 7 Levels Adjustable Sensitivity Control,No Harm Warning Beep and Vibration (Black) 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 It comes with one odd, but replaceable 6v battery. Pull out the insulating paper in the battery box before using Adjustable nylon collar senses vibration in dog's throat during barking; Shipping from US warehouse,1-3 working days to arrive you.