what is this on my Drivesmart 66 power cable?

[jimspoon]

What is the rectangular thing on the Drivesmart 66 power cable (under the number 2)? I thought it might have be a traffic antenna/receiver but the Drivesmart 66 manual says it gets its traffic info from the Drive app on the smartphone, I assume via the bluetooth connection.

 

[Nuvi-Nebie]

Here are a few guesses :-

1. A radio receiver for traffic data
2. A radio receiver for a wireless back-up camera
3. A power converter
4. Circuitry for the 3.5mm audio socket (1)

If I had to choose I would probably go for guess No. 2. above, Garmin sometimes use an existing power cable designed for a previous product, so it may not have a function at all on your unit