With the
release of iOS 10 beta 3 a days ago, a new feature was found in iOS 10 beta 3
which will now warns you if liquid is detected in your Lightning connector or port. This new feature was shared on reddit by lucioghosty and posted to Imgur. So when
your iPhone, iPad or iPod touch detects that the Lightning port is wet the
following prompt or notification appears on screen…
  • Disconnect Lightning Accessory
  • Liquid has been detected in the Lightning connector. 
  • To protect your iPhone,
    disconnect this Lightning accessory and allow the connector to dry.

With the release of iOS 10 beta 3 a days ago, a new feature was found in iOS 10 beta 3 which will now warns you if liquid is detected in your Lightning connector or port
Well this
feature is awesome because when your port is wet it will pop up an error notification what is
happening in actual. In the below section you can see the Ignore option to
Ignore that message, please do not ignore that message. If you select this option,
you are repeatedly asked to confirm your selection and warned that
“Ignoring this message may cause irreparable damage to your iPhone”.
So do not take a risk.

Apple is rumoured to be improving water resistance with the iPhone 7 so Apple
added this feature which may be part of it.
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Source : Reddit