> For the complete documentation index, see [llms.txt](https://docs.ifreeq.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ifreeq.com/general-knowledge.md).

# General Knowledge

- [About IoT](https://docs.ifreeq.com/general-knowledge/about-iot.md)
- [Electricity](https://docs.ifreeq.com/general-knowledge/electricity.md)
- [Plug & socket types around the world](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world.md)
- [Power plug & outlet Types A & B](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-types-a-and-b.md)
- [Power plug & outlet Type C](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-c.md)
- [Power plug & outlet Type D](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-d.md)
- [Power plug & outlet Type E](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-e.md)
- [Power plug & outlet Type F (Schuko)](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-f.md)
- [Power plug & outlet Type G](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-g.md)
- [Power plug & outlet Type H](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-h.md)
- [Power plug & outlet Type I](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-i.md)
- [Power plug & outlet Type J](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-j.md)
- [Power plug & outlet Type K](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-k.md)
- [Power plug & outlet Type L](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-l.md)
- [Power plug & outlet Type M](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-m.md)
- [Power plug & outlet Type N](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-n.md)
- [Power plug & outlet Type O](https://docs.ifreeq.com/general-knowledge/electricity/plug-and-socket-types-around-the-world/power-plug-and-outlet-type-o.md)
- [Full list: Plug, socket & voltage by country](https://docs.ifreeq.com/general-knowledge/electricity/plug-socket-and-voltage-by-country.md)
- [Map showing the spread of the different plug types worldwide](https://docs.ifreeq.com/general-knowledge/electricity/world-map-showing-the-spread-of-plug-types.md)
- [Useful information for travellers](https://docs.ifreeq.com/general-knowledge/electricity/useful-information-for-travellers.md)
- [History of domestic electricity](https://docs.ifreeq.com/general-knowledge/electricity/history-of-domestic-electricity.md)
- [Why isn’t there a universal standard electric plug?](https://docs.ifreeq.com/general-knowledge/electricity/history-of-domestic-electricity/why-isnt-there-a-universal-standard-electric-plug.md)
- [Why isn’t there a standard voltage around the world?](https://docs.ifreeq.com/general-knowledge/electricity/history-of-domestic-electricity/why-isnt-there-a-standard-voltage-around-the-world.md)
- [Three-phase electric power (industrial applications only)](https://docs.ifreeq.com/general-knowledge/electricity/three-phase-electric-power-industrial-applications-only.md)
- [Certifications](https://docs.ifreeq.com/general-knowledge/certifications.md)
- [Home Automation Brand](https://docs.ifreeq.com/general-knowledge/home-automation-brand.md)
- [Home Automation Catalog](https://docs.ifreeq.com/general-knowledge/home-automation-catalog.md)
- [Industry Term](https://docs.ifreeq.com/general-knowledge/industry-terms.md)
- [Network Term](https://docs.ifreeq.com/general-knowledge/network-terms.md)
- [The Third-party Control](https://docs.ifreeq.com/general-knowledge/the-third-party-control.md)
- [AliGenie](https://docs.ifreeq.com/general-knowledge/the-third-party-control/aligenie.md): https://aligenie.com/
- [Amazon Alexa](https://docs.ifreeq.com/general-knowledge/the-third-party-control/amazon-alexa.md): https://alexa.amazon.com/
- [FAQs About Amazon Alexa](https://docs.ifreeq.com/general-knowledge/the-third-party-control/amazon-alexa/faqs-about-amazon-alexa.md)
- [DuerOS](https://docs.ifreeq.com/general-knowledge/the-third-party-control/dueros.md): https://dueros.baidu.com/
- [FAQs About DuerOS](https://docs.ifreeq.com/general-knowledge/the-third-party-control/dueros/faqs-about-dueros.md)
- [Google Assistant](https://docs.ifreeq.com/general-knowledge/the-third-party-control/google-assistant.md): https://assistant.google.com/
- [FAQs About Google Assistant](https://docs.ifreeq.com/general-knowledge/the-third-party-control/google-assistant/faqs-about-google-assistant.md)
- [Home Assistant](https://docs.ifreeq.com/general-knowledge/the-third-party-control/home-assistant.md): https://www.home-assistant.io/
- [FAQs About Home Assistant](https://docs.ifreeq.com/general-knowledge/the-third-party-control/home-assistant/faqs-about-home-assistant.md)
- [HomeKit](https://docs.ifreeq.com/general-knowledge/the-third-party-control/homekit.md): https://www.apple.com/ios/home/
- [FAQs About Homekit](https://docs.ifreeq.com/general-knowledge/the-third-party-control/homekit/whats-homekit.md)
- [IFTTT](https://docs.ifreeq.com/general-knowledge/the-third-party-control/ifttt.md): https://ifttt.com/
- [Xiao AI](https://docs.ifreeq.com/general-knowledge/the-third-party-control/xiao-ai.md): https://xiaoai.mi.com/
- [Yandex Alice](https://docs.ifreeq.com/general-knowledge/the-third-party-control/yandex-alice.md): https://yandex.ru/alice
- [FAQs About Yandex Alice](https://docs.ifreeq.com/general-knowledge/the-third-party-control/yandex-alice/faqs-about-yandex-alice.md)