MB 2015 GLK keyless fob additional device?

Asked by Sep 16, 2017 at 03:27 PM

Question type: General

I have the keyless fob for my GLK by the
dealership also gave me another small
black device with a 2025 battery on the
key chain.  On one side it has an FCC ID
number sticker and the other side just a
light for low battery.  It has a metal band
around the front edge.

What is this?

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