# \#function-intro

**URL:** https://community.aosulife.com/tag/function-intro/25.md

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## [What does PIR stand for?](https://community.aosulife.com/t/what-does-pir-stand-for/327)

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**Author:** [@aosu\_Captain](https://community.aosulife.com/u/aosu_Captain)\
**Replies:** 0\
**Last updated:** [April 3, 2025, 6:56am UTC](https://community.aosulife.com/t/what-does-pir-stand-for/327 "2025-04-03T06:56:22Z")

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PIR stands for Passive Infra-Red. It is a technology used in security systems to detect movement or intruders by recognizing light emitted from nearby objects.

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## [What is Face AI?](https://community.aosulife.com/t/what-is-face-ai/184)

<div class="topic-metadata">

**Author:** [@aosu\_Captain](https://community.aosulife.com/u/aosu_Captain)\
**Replies:** 0\
**Last updated:** [March 14, 2025, 10:36am UTC](https://community.aosulife.com/t/what-is-face-ai/184 "2025-03-14T10:36:23Z")

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Facial Recognition is an additional function that is part of the cloud service. It can only be used with the doorbell. With this function enabled, you will see your or your family members’ faces in the notifications.