DURABLE MATERIALRobust PC construction ensures a virtually unbreakable door, it is sturdy and weather-resistant; The clear surface is easy to clean as well. 4-WAY LOCKThe biggest advantage of this cat flap door is that the lock with two knobs can provide 4 modes: open, lock, enter only (cats can enter but cannot exit) and only outwards (cats can exit but cannot enter); With the pet door, no longer had to close/open the door all the time waiting for your pet. PERFECT GLASS DECORATIONClear design to make the window screen with integrated mass, ideal for screen windows, sliding glass doors, glass windows; Ideal for all glass applications; Your pets will immediately fall in love with a stylish pet flap. FIT MOST SMALL PETSGenerous flap size 18.5*20.5cm / 7.25*8inch, suits all breeds of cats and small dogs puppy(6kg/13lbs) . SILENT AND SAFETYThere are brush strips at the edges of cat flap doors for interior doors, which can reduce the noise generated by pets when cats enter and leave the door; In addition, the silent movement will not scare the pet or disturb the owner with magnet control.