Esky Electronic No Bark Control Dog Taining Collar-Adjustable Sensitivity Control, 6 Volt Battery Included Humane, cost-effective and harmless to your dog. Generally recommend for 20-120lbs dogs. Compact, lightweight and non-obtrusive in appearance Delivers increasingly louder warning tones and shock corrections of 7 levels. Sensitivity is user-adjustable according to your dog's barking and specific environments. Voice recognition minimizes false triggering;Operates on a standard 6 volt alkaline battery(Included).