No Bark Dog Collar Activates from the vibration of the dog's vocal cords Receiver weight 7.5 ounces for medium to large breeds. Fully waterproof Convenient dial that controls the on/off function and the seven intensity levels Led battery life indicator Package contents includes yapper stopper with collar strap, rechargeable battery and charger, test tool, and owner's manual Activates from the vibration of dog's vocal chords Receiver weighs 7.5 ounces for medium-to-large breeds Convenient dial controls the on/off function and 7 intensity levels LED battery life indicator Fully waterproof so you can train even in the rain