4 Way Locking: No in & No out( Fully locked) Free in & Out( Fully open) Size S:19.7*19*2cm M:19.7*19*5.3cm L:25*23.5*5.3cm XL:27.7*25*5.5cm Note: Size S is a little different from other sizes. It's "thinner". Function Instruction of the Switches: Turn Red and Green switches to both sides, pet is prevented from entering or exiting house. Turn Red and Green switches to right side, pet is allowed to enter house, but prevent from exiting house. Turn Red and Green switches to left side, pet is allowed to exit house but prevent from entering house. Turn Red and Green switches to middle, pet can leave and exit any time. Outer door frame size Small: 20*19*2cm Middle: 20*19*5.5cm Large: 25*23.5*5.5cm Extra Large: 27.7* 25*5.5cm Inner door frame size Small: 16*15.7cm Middle: 16*15.7cm Large: 19*18cm Extra Large: 22*20cm Dear friend, Welcome to my store If you like this item,please add it to your " Wish List " , If you like our store,please add it to your "Store List ". 1.If you need the product in urgently, kindly please choose ePacket, China Post Air Mail, Standard Premium shipping or other express like DHL,EMS,UPS etc. 2. If you agree with our shipping time, please do not open dispute easily, your understanding is highly appreciated. 3. We\'d love to help you to solve any problem,please contact us before you leave us negative feedback . 4,Your approval is our motion. Thanks so much for your support. Best wishes. We offer dropshipping and wholesale For dropshipping orders ,you can also place orders by CSV/ excel file when your orders are over 100 orders or the total Amoun over 500 USD. We promise there is no ads ,price list ,invoice ,or our store information into the package. Our company have a team deal with the dropshipping orders everyday and find different kinds of the products in the market ,we have experience. If you have any needs for the produts we don't have for the moment,or you find our price is higher than the competitors you can be free to let us know ,we promise we can offer you the better price with better quality. Any problems just let us know We will do our best to support our cooperation