PROVEN RELIABLE: This is the Original, Reliable Power Pet Fully Automatic Pet Door by High Tech Pet Brand. Engineered, Assembled and Serviced in USA. Proven Reliable with over 100,000 units in operation. SAFE GRAVITY CLOSURE with AUTOMATIC ANTI-PINCH SYSTEM: Closing the pet access panel is intrinsically safe because the panel is lightweight and closed by gravity, not the motor. In addition our patented anti-pinch system automatically reverses the panel and drives it upward should it encounter an obstical during closure. 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. 4 WAY ACCESS CONTROL: Select from Enter Only, Exit Only, Enter & Exit or Closed and Locked. DUAL SENSOR SYSTEM: Control Individual Inside and Outside Activation Ranges from 0 to 30 feet. 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. 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: 8-1/4" by 10" high. For Pets up to 100 lbs. POWER: Powered by AC Adapter or Optional Rechargeable Battery. A BRAND YOU CAN TRUST: Since 1986 High Tech Pet has been the leader in creating and manufacturing the highest quality, most innovative automatic pet doors. We support our USA assembled products with live, friendly, knowledgeable, HUMAN customer service experts to assist you when you need us. Engineered for performance, design, value and extreme reliability, Power Pet doors are motor driven and activated by a tiny ultrasonic collar. Other electronic pet doors still require your pet to push open a flap. That's something a lot of pets don't like to do. Patented Power Pet doors open quickly and quietly, completely under their own power. They feature an attractive translucent door panel made of a new super-strength, bulletproof resin. When your pet approaches, the air-tight panel quickly and quietly powers upward, disappearing into the stylish housing. The panel is hermetically sealed and remains 100% air-tight, even in hurricane force winds. When closed, the panel engages a steel deadbolt lock making it impossible for an intruder to kick it out or open it from the outside. The result is the most secure pet door against wind, weather, intruders and stray animals. Your pets are empowered to come and go as they please. Their animal friends are politely asked to stay out. Power Pet's unique directional sensing system opens the door only when your pet is on a direct approach, not when just wandering by. Its ingenious 4-Way Access Control lets you select from: Enter Only, Exit Only, Enter and Exit or Closed and Dead-bolt Locked. Dual range controls let you set independent inside and outside activation distances. Large panel size: 12-1/4 by 16-inch for pets up to 100 pounds. Operates on AC adapter (included). Optional backup battery (model B12V-1.3 sold separately) snaps into the battery compartment to keep your Power Pet door functioning in the case of a power outage, or if you prefer to operate solely on battery power you can add an external battery charger (model CRG-12V sold separately). Operated by our small, rugged and waterproof MS-5 transmitter collar. Collar battery (included) will last up to 4 months. (Please use genuine High Tech Pet collars only. Imitation collars can cause your pet to get locked out.) High Tech Pet invented the Automatic Pet Door and has been manufacturing door that set the standard of reliability and quality since 1986. With hundreds of thousands of product in operation, trusted Power Pet brand automatic pet doors have a proven track record of safe, reliable operation. Included with your purchase you get our USA based, personal customer service experts to make sure you get the highest level of friendly, knowledgeable support.