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2. Electric gate - Wikipedia

   en.wikipedia.org/wiki/Electric_gate

   Electric gates alone, however solid and imposing they may be, cannot guarantee a completely secure environment electric locks, are often needed to boost the locking effectiveness of the gate motors. Electric gates are recommended to be used in combination with other security features to install a full security system.

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4. Battery energy storage system - Wikipedia

   en.wikipedia.org/wiki/Battery_energy_storage_system

   This kind of power electronics include gate turn-off thyristor, commonly used in high-voltage direct current (HVDC) transmission. Various accumulator systems may be used depending on the power-to-energy ratio, the expected lifetime and the costs. In the 1980s, lead-acid batteries were used for the first battery-storage power plants.

5. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   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.

6. Chamberlain Group, Inc. v. Skylink Technologies, Inc. - Wikipedia

   en.wikipedia.org/wiki/Chamberlain_Group,_Inc._v...

   In 1992, Skylink produced a universal transmitter called Model 39 that was designed to work for both rolling code and non-rolling code GDOs. The Model 39 bypasses the Chamberlain's rolling code system by imitating Security+'s resynchronization feature.

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