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A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.
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.
Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix to denote that the Chamberlain Group made them for Sears. Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards.
Harmony 670, a universal remote. A universal remote is a remote control that can be programmed to operate various brands of one or more types of consumer electronics devices. . Low-end universal remotes can only control a set number of devices determined by their manufacturer, while mid- and high-end universal remotes allow the user to program in new control codes to the re
Universal design is the design of buildings, products or environments to make them accessible to people, regardless of age, disability, or other factors. It emerged as a rights -based, anti- discrimination measure, which seeks to create design for all abilities.
Universal coding may refer to one of two concepts in data compression: Universal code (data compression) , a fixed prefix code that, for any probability mass function, has a data compression ratio within a constant of the optimal prefix code
UNCOL (Universal Computer Oriented Language) is a universal intermediate language for compilers. The idea was introduced in 1958, by a SHARE ad-hoc committee. [ 1 ] It was never fully specified or implemented; in many ways it was more a concept than a language.