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Depends how long you want the parking mode?
Mine covers 12 hours - using the car battery - which is more than enough cover when parking at work etc.
In the 14 months i've had it in/ my car never had a low battery warning or issues with the keyless entry or even DAB.
imo the BMW one is a lot of money for little more than paying for the BMW name - the lens and functionality is inferior to those in the Blackview/ Thinkware and the install itself is uglier. Only saving grace is that it wired to the car and not a piggyback system to the power.
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