Cat door window

Cat door inside a window attachment, intended for windows that slide up and down, stick this inside your window to let your feline friends in and out. 

The sides accordion in 2.5 inchs on both sides, making this fit multiple sized windows. 

measurements: 45.5" L when accordioned all the way in, 50.5"L when extended all the way out

just shy of 16.5"H