High Tech Pet 12-in x 28-5/8-in White Composite Medium Dog/Cat Door for Entry door/Wall

12-in x 28-5/8-in White Composite Medium Dog/Cat Door for Entry door/Wall. Fully automatic, pet-operated dog and cat door. Unlike other electronic pet doors, Power Pet doors do not require your pet to push open the panel. Engineered for performance, value and extreme reliability. Operated by a tiny ultrasonic collar that will not interfere with or be affected by other electronic devices. Motor driven to open and close all by itself. Mounts to any door or wall (wall installation tunnel, model WA-1 sold separately). When your pet approaches, the attractive, translucent panel quickly and quietly powers upward, disappearing into the stylish housing. Hermetically sealed panel provides the best weather insulation of any pet door made - air-tight even in hurricane-force winds. Increases energy efficiency - lowers home heating and cooling bills (compared to conventional pet door installation)