PetsLove 4-Way Locking Indoor/Outdoor Pet Door for Cats and Small Dogs Four-way locking pet door, gives your cat or small dog the freedom to come and go without bothering you; 4 ways locking, both wanys locked, only out, only in, in and out; Transparent flap lets you and your pet see what's on the other side of the door; Easy to install; waterproof and tightly sealed to prevent energy loss, brush strip eliminates noise from the door closing Size info: S, 8.74"*7.56"*0.86", M, 8.78"*7.56"*2.16", L, 9.45"*9.25"*2.16"; delivery time: 7-12 days.