This easy-to-use bark control collar will safely and effectively teach your dog to stop barking. The collar's vibration sensor detect the dog's vocal cords moving to help ensure no false corrections. Includes 6 levels of progressive static correction which means if your dog continues to bark the correction will automatically increase to the next level until he stops. No programming needed. Waterproof. Uses PetSafe Battery No. RFA-67D-11. For dogs 8 lbs. or more. Neck sizes up to 28". For dogs weighing more than 8 lbs. 6 volt lithium battery included. Vibration detection ensures only your dog gets corrected.