Fully automatic Power Pet door designed by High Tech Pet for dependable performance and supported by a dedicated customer service team. Fully automatic, pet-activated operation using the MS-5 ultrasonic collar. Includes an MS-5 collar that is lightweight, waterproof, and designed to operate quietly. Large 12" X 16" Flap for Pets up to 100 lbs. Installs Easily in any Door or Wall. (For easier wall installation order our All Alluminum Wall Tunnel ASIN B0C8HJL2JP) Directional Sensing: Unique Directional Sensing System Opens the Door Only When Your Pet is on a Direct Approach, Not When Just Wandering by or Sleeping Next to the Door. 4-Way Control Access: Select from Enter Only, Exit Only, Enter & Exit or Closed and Locked. Dual Range Control: Control Individual Inside and Outside Activation Ranges. High Security: Secure Automatic Dead Bolt Lock protects against intruders. Attractive. Translucent Panel is Intruder-proof, Shatter-proof and Cannot be Forced Open or Lifted From the Outside. Wind and Water Resistant: Hermetically Sealed Panel is 100% Air Tight and Draft Free, Even in Hurricane Force Winds. Automatic Safety Retract System: Unique Anti Pinch System, Invented by High Tech Pet automatically lift the access panel should it encounters an obstacle during closure. Power: Powered by AC Adapter or Optional Rechargeable Battery. 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 impossible for an intruder to kick it out. An automatic dead-bolt locking feature adds a high level of security. The result is a secure pet door that allows your pets to come and go as they please while their animal friends are politely 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 a direct approach. 4-way access control lets you select from In Only, Out Only, Full Access or Closed and Locked. Dual range controls let you set independent inside and outside 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 ensure that your sliding glass door opening leaves enough room for walking in and out after deducting 12" (med) or 18" (lg) for installation.