Hello,
1. what operating system?
2 - Does Wifi work with a sim card? So buy separately? Or paid by the manufacturer?
3 - What kind of video input does the mount have?
4.- Is the magnetic holder included?

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Answer

Have a look at the manufacturer's website:
https://buy.garmin.com/de-AT/AT/p/684267#specs
The mount is included, operating system seems to be the latest from Garmin. I don't think this device has a video input. This device does not have wifi. GPS is a service paid for by the government.

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Question about Garmin Decl LGV800

Hello, 1. what operating system? 2 - Does Wifi work with a sim card? So buy separately? Or paid by the manufacturer? 3 - What kind of video input does the mount have? 4.- Is the magnetic holder included?