Mine was a REC-11 from Omega, but basically the same as what you used to do the job. It came with a piezo buzzer to provide audible feedback when operating buttons and programing but it is very very quiet. I think I will use a 30 amp relay and the piezo trigger wire to operate the car's horn instead of the buzzer so I can hear that it received the button input. Also, I have a pink wire 3rd channel that I dont have a use for, a trunk unlock/popper is useless with the MB trunk lock and opening mechanism. Closing of opening a window or the sunroof just sounds like a wiring nightmare and asking for trouble and I cant think of any other uses for it. Any ideas?

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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