Baishan Dog Anti Barking Collar Adjustable Sensitivity 7 sensitivity levels (1-7) adjustable for the different size of dogs barking and specific environments through the "+" /"-" button 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 Humane, effective and easy to use. Static anti bark collar stops unwanted barking with progressively increasing warning sounds and harmless static stimulus. Lightweight receiver, Unique bark terminator, Effective on a 15-120pounds dog Adjustable nylon collar senses vibration in dog's throat during barking