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2. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

3. Category:Garage door openers - Wikipedia

   en.wikipedia.org/wiki/Category:Garage_door_openers

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

4. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...

5. Universal receiver - Wikipedia

   en.wikipedia.org/wiki/Universal_receiver

   The first electric garage door opener was created in 1921 by C.G. Johnson. He realized there was a problem with garage doors being in the way when needed to be opened and found a solution that would change the way Americans lift garage doors forever. He called it the "upward lifting garage door."

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Used in small RF devices such as key fob-style garage door openers, wireless doorbells, and keyless entry systems where only infrequent pulse current is used. Usually contains a stack of eight LR932 button cells shrink wrapped together. A27: GP27A MN27 L828 27A V27A A27BP G27A: 8LR732 (alkaline) 22 (alkaline) 12: 8.0 × 28.2

7. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   A receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code. Upon comparison of the fixed and rolling codes with stored codes and seeing that they pass a set of algorithmic checks, a signal is generated to actuate an electric motor to open or close a movable component. [citation needed]