Dimension:71.0mmX 30.0mm X 40.0mmMax Girth: approx. 62 mmPower: 1 X 4LR44 6V batteryProduct Feature: Humane uses painless tone followed by shock only if barking persists. Automatically increases tone and shock stimuli as barking persists. Microprocessor controlled. Operates on a standard 6 volt battery. Voice Recognition feature minimizes false triggering. Extremely small and light weight. Effective on dogs from 5 pounds to 150 pounds. APSD-Automatic Power Saving Mode. Please Note: The Bare Terminator is designed to be water resistant， But it is not fully soggy.Package Includes: 1 x Bark Stop Controller 1 x Test light 1 x 6V alkaline battery 1 x English Manual