The Richell Convertible Indoor/Outdoor Pet Playpen is made of durable plastic that can be used inside and outside. You can use this walkthrough pet gate as a gate, divider or pen inside to cover your large openings. The dog exercise pen can be placed outdoors as a playpen so your pet can join in on outside activities! The wide pet gates feature a self-locking door also provides quick and easy access to you and your pet. Available in three different heights. No tools required for assembly! An optional Convertible Floor Tray is available and sold separately. Specially designed wide pet gates caps lock the panels in place at 90