Features: 1.4 Way Locking: Our cat flaps with dual knob?style locks offer 4?way modes: open, locked, in?only (cat can enter but not exit) and out?only (cat can exit but not enter), to control pets in and out of your home 2.Noise Reduction: The small dog flap is designed with a brush strip to reduce noise when pets comes in or out the door; Silent action will not frighten pets or disturb owner 3.Beautiful Decoration for Glass Window and Door: YOUTHINK small pet door is transparent, so after installation on clear glass window/door, they will seems like a whole body; Ideal for installation on glass window and sliding glass door 4.Fit Cats and Small Dogs: Flap size is 7.5" x 6.1"; Our small dog door suits all breeds of cats and some small dogs up to 6kg / 13lbs 5.Durable Materials: Pet flap is made from high?quality ABS, weather?resistant, sturdy, long lasting; Robust UV stable 100% polycarbonate construction ensures a virtually unbreakable dog door Specification: Specification: Suitable weight: All cats and small dogs(6kg / 13lbs ) Material: Durable ABS plastic, safe and non-toxic Flap size: 19 x 15.5cm / 7.5 x 6.1inch Door size: 30 x 30 x 2cm / 11.8 x 11.8 x 0.8inch Package Included: 1 x Pet Door for Glass Window 3 x Short Screws 3 x Long Screws 3 x Screws Cap Note: 1. The product is not suitable for installation in the screen door; 2. The glass door can be installed by glass glue, or it can be fixed by screws;