Petiner Electronic No Bark Control Dog Taining Collar-Adjustable Sensitivity Control,Low sensitivity Humane,Cost-effective and harmless to your dog.Generally recommend for 15-100lbs dogs Sensitivity is user-adjustable according to your dog's barking and specific environments. Lightweight receiver perfect for toy or small breeds Delivers increasingly louder warning tones and shock corrections of 7 levels Includes receiver, operating manual and replaceable 6-volt battery