EST Posted January 11 Report Share Posted January 11 Is anyone knows what that "extra" on battery for? BMW G11 2018 Quote Link to comment Share on other sites More sharing options...
Cameron Avery Posted January 11 Report Share Posted January 11 That looks like an anti-theft device for preventing relay attacks. Battery sits inside it and only switches on power in certain situations I think. EST 1 Quote Link to comment Share on other sites More sharing options...
XTof75 Posted June 2 Report Share Posted June 2 Very strange device. I know very well this device, and i am very surprised to see this "extra" Can you provide a closer picture where we can see the marking on the electronic components. Is the "extra" can be removed ? can you provide pictures? I am very interested in this Best regards Quote Link to comment Share on other sites More sharing options...
XTof75 Posted June 2 Report Share Posted June 2 origine of this extra found: https://www.dgce.nl/auto-alarm/keyless-protector-met-ke01-certificering-p-2912.html Best regards Quote Link to comment Share on other sites More sharing options...
Trev Posted June 2 Report Share Posted June 2 (edited) Weird the id21a version of that remote already has a motion sensor: https://f48.bimmerpost.com/forums/showthread.php?t=1798116 Edited June 2 by Trev Quote Link to comment Share on other sites More sharing options...
Auto Key Wizard Posted June 2 Report Share Posted June 2 https://keylessprotector.com/ EST and Cameron Avery 2 Quote Link to comment Share on other sites More sharing options...
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