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Thanks for the reply. When you say internal battery, is that contained within the siren? i.e. not the auxiliary batter which is located in the boot?

Thanks for the reply. Is that the auxiliary battery which is located in the boot or is there another battery actually located inside the alarm?

I own a 2015 E220 and I am having problems with the locking. When I get out off the car and press the button on the key to lock the car, the alarm makes a sound like the horn, the doors lock but the alarm does not set. Instead the indicator lights flash quickly and keep on flashing. If I press...