oh... i did not install in BMW.. I installed in a Altis and several lorries. They tap power from source around radio - that's where they can get power-ignition and power-cold.
I have been using car track for all my cars now since a few years.So far haven't had any problems. However, you would be required to go back to them to get the battery replaced which from my experience is after 2 years.
They do test tracks for your vehicle every now and then to ensure its working correctly
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