This window opens when you use the correct knock knock code.
2 ft x 3 ft window comes painted with shutters and magnetic lock installed with wiring and themed wiring conduit and themed box for electriconic housing (cover for outlet). Knock knocker installed into window and instructions on where to install knocker.Wiring ready. 
 
Testing - All of our product is tested before public use. This product has been in public use for 5 months and has last over 3000 people in an escape room environment. 
 
See Video of Prop Here
 
Add sound option $450: Comes with button inside, electronics that support a mirco SD card and speaker