Pet Door, Folding Panel, Cat Door, and Dog Door with Four Locking Options, Suitable for Wood, PVC, Waterproof. Suitable for Pets Under 15 kg 4 locking methods: the cat door has 4 locking methods: open inward, open outward, open and locked in both directions. If the pet wants to come into the room, you no longer need to open the door. The cat door makes life easier and gives your pet freedom at home. Very quiet: this freely rotating door is very quiet and offers the best wind protection due to specially reinforced door panels. Three-step brush strips can eliminate noise when the door opens and closes. It also stops raindrops or pests like mosquitoes. Easy installation: this pet door is suitable for brick walls, thread doors, PVC, and metal doors and can be installed in doors and walls with a thickness of 2 to 5 cm. A step-by-step installation instruction is included in the user manual (English language not guaranteed). Please note this and prepare the necessary tools, which are easy to install if needed. High-quality material: the door frame is made of PP material, and the transparent protective cover is made of high-strength PE material, which resists ultraviolet radiation, has good transparency, prevents pets from grabbing and biting, and is resistant to moisture and wear. Suitable for: inner dimensions: 3 cm (D) x 15 cm (B) x 14.7 cm (H), suitable for pets with a waist circumference of less than 44 cm.