DAN SPEED Anti-Bark Collar -Shock Collar For Dogs with Bark Control Collar Humane uses painless tone followed by shock only if barking persists. Patented design with small and fine of meniscus shape. Easy and convenient to test the functionality and sensitivity by blowing. Infinite sensitivity adjustable by gear to suit for different dogs. More humane design, it will be forced to stop shocking (last for one minute) if he/she continuous barked for 5 times.