WF130 In-house Window Feeder. The original in-house feeder! Locking lid provides easy access for filling and cleaning and the mirrored panel (made of plexi-glass) allows for up-close viewing. Hinge latches which are on both sides of the feeder make it possible to open inside the house while it is still in the window. Fits windows up to 49.5 in wide via cut to size extension panels. 1.25 pound capacity.