Power Pet doors are motor driven and activated by a tiny ultrasonic collar. Unlike other electronic pet doors that merely unlock a hinged panel, requiring your pet to push it open, Patented Power Pet doors open completely under their own power. When your pet approaches, the air-tight translucent super-strength resin door panel quickly and quietly powers upward, disappearing into the stylish housing. Mounted in hermetically sealed grooves for air-tight closure, this mounting arrangement makes it inconceivable for an intruder to kick it out. An automatic dead-bolt locking feature adds a high level of security. The result is a safe pet door that allows your pets to come and go as they please whilst their animal friends are in a well mannered way asked to stay out. The digitally coded signal emitted from your pet’s ultrasonic transmitter collar allows the Power Pet to open only when your pet is on an instantaneous approach. 4-way access keep watch over means that you can select from In Only, Out Only, Full Access or Closed and Locked. Dual range controls help you set independent outside and inside activation distances. Comes in 3 Models Door Install Model Wall Install Model (Each comes in 2 sizes (Medium – up to 30 lbs. and Large – up to 100 lbs. Sliding Glass Model (Comes in 2 sizes Medium or Large) Each size comes in 3 height ranges Regular, X-Tall and Shorty. Our Sliding Glass Model turns a sliding glass door into a fully automatic pet door. Power Pet door is pre-installed in an aluminum framed glass insert to fit into a sliding glass patio door. The only electric pet door slim enough for a practical patio door installation. NOTE: Power Pet Door installs alongside your existing sliding glass door. Please make certain that your sliding glass door opening leaves enough room for walking in and out after deducting 12″ (med) or 18″ (lg) for installation.