A great tool for puppy toilet training and obedience training. There is no more need for accidents in the house or chewed furniture or sneaky bad behaviour when you are not looking. When you are busy and cannot keep an eye on your new puppy place them in the exercise pen so that you can do what you need to do and when you can once give your full attention back to the puppy you can take him out again. Can be used inside or outside. No tools required for set up. Each of the 8 panels come as a separate piece so you can leave some panels out to make your pen smaller.