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2. Pet door - Wikipedia

   en.wikipedia.org/wiki/Pet_door

   Pet door. A dog exiting through a pet door. A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human to open the door. Originally simple holes, the modern ...

3. Pet fence - Wikipedia

   en.wikipedia.org/wiki/Pet_fence

   Pet fence. A pet fence or fenceless boundary is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored. The system was first invented and patented by Richard Peck ...

4. Electric eye - Wikipedia

   en.wikipedia.org/wiki/Electric_eye

   An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam. The device does not provide an image; only ...

5. How doggy doors are making your home vulnerable - AOL

   www.aol.com/article/lifestyle/2019/09/16/how...

   We asked a security expert for the 411 on doggy doors and home safety. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Mail ...

6. Basset Hounds Teach Golden Retriever to Use Doggy Door Like a ...

   www.aol.com/basset-hounds-teach-golden-retriever...

   Thankfully, the two Hounds are generous with their secrets and were willing to show Anya exactly how the dog door worked. It took a few tries but the dog finally figured out the method. Ta-da!

7. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   A residential garage door opener. The motor is in the box on the upper-right. A garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance.