What is "power outage count" on some of my switches?

Can anyone tell me what Power Outage Count is on some of my switches and sockets? Only just noticed it but I don’t think they detect power use so not sure what they’re doing
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Counts the amount of times, the switch had no feeding power at al. Could be blown fuse, outage of supply from your distributor, or there is some mechanical switch in front of your smart switch.

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