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How does 888LM know the door is open/closed?

How does the 888LM know it was successful when opening/closing the door?  I noticed the MyQ  Garage Door Controller has what looks like a tilt sensor that gets attached to the garage door.  But how does the 888LM accomplish this?

I just want to know if the reported status on the app can ever get out of sync with reality.

Also, are the wires only used to charge the battery inside the 888LM?  Seems you still need to program the device as a remote.
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