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2. Wireless light switch - Wikipedia

   en.wikipedia.org/wiki/Wireless_light_switch

   Wireless light switches eliminate the wire from the light to the switch location. This is useful in remodelling situations where new wiring can be a hassle. Rather than tearing down a wall to gain access to the wires, a wireless switch can be used. This avoids any need to access wires and makes remodelling fast and simple.

3. EnOcean - Wikipedia

   en.wikipedia.org/wiki/Enocean

   One example of the technology is a battery-free wireless light switch. Advantages are that it saves time and material by eliminating the need to install wires between the switch and controlled device, e.g., a light fixture. It also reduces noise on switched circuits, as the switching is performed locally at the load.

4. Lightning switch - Wikipedia

   en.wikipedia.org/wiki/Lightning_Switch

   The Lightning Switch transmitter requires no outside source of electricity.Each time the transmitter button is pressed, the transmitter converts the mechanical energy supplied by the user's finger into electricity to power a radio transmission to a receiver/relay through the use of a piezoelectric generator (brand name: Lightning) originally invented by the National Aeronautics and Space ...

5. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.

6. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   A wireless light switch allows remote control of lamps for convenience; some lamps include a touch switch which electronically controls the lamp if touched anywhere. In public buildings several types of vandal resistant switches are used to prevent unauthorized use.

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