2-way mirror lets you watch feeding birds up-close, but they can’t see you! Designed to sit inside the house, this feeder is easy to install with our unique dove-tailed, sliding side panels. Simply place the feeder on the windowsill and slide the panels out to fit the window. Easy to fill and clean from inside your home. Fits most double hung windows from 26” to 36” wide. Made in the USA of plantation grown Mahogany.