GENUINE POWER PET AUTOMATIC PET DOOR by HIGH TECH PET BRAND: Medium for Pets up to 30 lb. This door is recognized for its brand name quality and reliability. OPERATED by MS-5 PET COLLAR: Includes Genuine MS-5 Ultrasonic Pet Collar (Use only Genuine High Tech Pet Brand Collars, Non OEM brands may fail to opent the Power Pet Door.) INCLUDES ALUMINUM WALL TUNNEL: Heavy Gauge, Ultra Durable All Aluminum, Powder Coated Wall Tunnel complete with No Rust, Stainless Steel hardware. For Walls 5½" to 7¼" thick. Additional telescoping tunnels tunnels may be added for even thicker walls (ASIN B0C8HMJFWY). SECURITY DEADBOLT: Autolocking Stainless Steel Deadbolt keeps the door secure against would-be doggy door bandits, keeps out stray animals. Beautiful, translucent access panel is shatterproof and bulletproof. SAFE GRAVITY CLOSURE & PATENTED ANTI-PINCH: The pet access panel is opened by a whisper quiet motor but, it is gently closed by a safe gravity return system. In addition, High Tech Pet's patented automatic safety retract system reverses the panel to open should it encounter an obstacle during closure. EXCLUSIVE FEATURES: 4 WAY ACCESS CONTROL: Select from Enter Only, Exit Only, Enter & Exit or Closed and Locked. DIRECTIONAL SENSING: MS-5 Collar Opens the Door Only When Your Pet is on a Direct Approach, Not When Just Wandering by or Sleeping Next to the Door. DUAL RANGE CONTROL: Allows you to independently adjust the Exit and Entry Range from 0 to 30 ft. 100% AIR TIGHT, WIND AND WEATHER RESISTANT: Hermetically Sealed Panel is 100% Air Tight and Draft Free, Even in Hurricane Force Winds! SMOOTH, FAST and QUIET: Developed by expert electro mechanical engineers to open in time for the fastest dogs with whisper quiet operation. MEDIUM PANEL SIZE: 8" by 10" for Pets up to 30 lbs. A QUALITY PRODUCT with UNPARALLED US CUSTOMER SERVICE: Power Pet Doors are Engineered, Assembled, Sold and Serviced in the USA by High Tech Pet Products, Inc. Our helpful, friendly, knowledgeable, human specialists are standing by with live help when you need it. An automatic pet door is an investment in your pet's safety and convenience and the security of your home. Make sure you buy a quality unit by the leading manufacturer who will stand behind it 100%. 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.