Just a note to all you that have had problems with your alarms going off for no reason or not arming. I found this on Ebay and it is cool since it was a replacement part since it has a manufacture date of 1992. It should work for all w201 124 and 126 cars. I just replaced mine with a used unit since a new OEM one is like $500 or more!
I know a few of you were asking how to fix the alarm not too long ago and some decided to just unplug it. I figure you cant go wrong at this price, I might pick it up as a spare if no one else does. NO, it is not my auction.

http://cgi.ebay.com/ebaymotors/Mercedes-107-124-126-201-Alarm-Control-Unit-300SE-420_W0QQcmdZViewItemQQcategoryZ33721QQihZ007QQitemZ170180429986QQrdZ1QQsspagenameZWDVW

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red