The advanced bark stop collar is most humane design with first tone warning then automatically increase stimulation...

Bark terminator advanced progressive shock collar: this product is used to stop dog barking. The bark terminator is simply and can stop the dog barking fast and effectively. It is adopted the unique method. Features: 1) Automatic progressively increasing stimulus 2) "Sure sense" voice recognition system 3) No uncomfortable vibration sensor 4) Extremely small and light weight (less than 1.5oz.) 5) Effective on dogs from 5 pounds to 150 pounds 6) Operates on a single, long life, 6V alkaline battery (available below) 7) Guarantee to stop your pet bark in 3 days

Bark Terminator (Advanced Progressive Shock Collar)