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changing my front door with alarm sensor on?

i am changing my front door the old door has two round things on bottom of door and frame i am presuming these are sensors for my alarm what will happen when they take my old door out i cant see any wires
mandy, January 2011
just to make sure you know whats what,the contact is in the frame,the magnet is in your door,

gts, January 2011
Put the contact back from the old door.

Alarm, January 2011