This is what the Ace2 does. Taken from the User Manual,
The ACE 2 monitors its own power requirement in parking mode. After it has consumed a defined quantity of power, the radar system will be disabled and the car will only be monitored by the G sensor. The G sensor monitoring will also be disabled after a further defined quantity of power has been consumed, meaning that the ACE 2 will be shut down. This prevents the car's battery becoming drained so that the car can still be started.
The energy consumption and therefore the duration of possible monitoring depends on the activity of the ACE 2 in parking mode and on the condition of your car battery.
Please check the condition of your battery.
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Everthing goes to Entropy in this Age.
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