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LMAO you guys had me rolling reading those guesses as to what it was.
Whoever serviced the car attaches one of those to the keyring and the key is entered into a system that holds the keys in a locked drawer, each one 'plugged' into its own hole in the drawer, and a computer that controls the system knows which key is in which hole.
When someone signs in to the computer and punches up the key they need, it unlocks the drawer and illuminates the LED of the fob attached to the key that entered.
When the person removes the key, it keeps track of who took out the key at what time on what day so if someone else tries to get the same key, they will be able to see who it is signed out to.
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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic
past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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