E-BEST New Arrival Anti-Bark No Barking Dog Training Electric Shock Control Collar Terminator Humane uses painless tone followed by shock only if barking persists. Automatically increases tone and shock stimuli as barking persists. Microprocessor controlled, And Extremely small and light weight. Operates on a single long life, 6 volt alkaline battery. The biggest voltage is 13V, when shocking. Effective on dogs from 5 pounds to 150 pounds. APSD-Automatic Power Saving Mode.More than 2000 times shock, and stand by more than 45 days.