The Thermo Sash 2e combines the dual pane Thermo Sash with the Sureflap Microchip Pet Door. When these two best-in-class products are combined the result is an electronic pet door for your sash window superior to anything previously available. The Thermo Sash employs dual-pane, low 'e' glass together with beefy framing, automatic width adjustment and full weather-stripping which offers the best performance available in a manual sash window pet door. The Sureflap Microchip Pet Door works with either your pets' microchip (compatible with the following commonly used microchips in North America) or an included RFID CollarK key. This door includes a 4-way lock (in only, out only, locked or unlocked) and has a timer control so you can the settings to activate at a given time. It has a lock that prevents the flap from being pushed in by using two locking points. There is a "raccoon mode" which engage additional locks. No tools are need for installation!