Specially Designed for Extreme Weather Climates, this Low-E Glass Dual Pane Sliding Glass Patio Insert turns any sliding glass door into a fully automatic pet door. A Power Pet door pre-installed in an extra-heavy aluminum framed glass insert that fits into your sliding glass patio door. Power Pet is the only electric pet door slim enough for a practical patio door installation. Made of high quality aluminum and tempered glass coated with an industrial quality powder coat finish, the patio door insert easily fits into your sliding glass patio door track. It features a spring loaded top section for quick, perfect installation. Your patio door slides shut against the insert and may be locked with our security locking bolt. Fits all sliding door track widths. Height range is 78-3/4 to 81-1/4 in., 18-in. wide. Engineered for performance, value, design and reliability, motor driven and activated by a tiny ultrasonic collar. When your pet approaches, the translucent door panel, made of a new super-strength resin, quickly and quietly powers upward, disappearing into the stylish housing. Because the panel moves up and down and does not swing out, it can be mounted in hermetically sealed grooves for air-tight closure. It's impossible for an intruder to kick the panel out. The result is the most secure pet door against intruders and stray animals. Your pets are empowered to come and go as they please. Their animal friends are politely asked to stay out. Panel size: 12-1/4 by 16-in. For dogs up to 90-pounds. Installation process usually takes less than one hour. Includes everything you need for a fully weather-sealed, lockable installation, including a transmitter collar and 110-volt AC adapter. Optional backup battery (model B12V-1.3) snaps into the battery compartment to keep your Power Pet door functioning in the case of a power outage.