If you point your remote at it it will flash red or green,,, dpending if your doors are locked or not. In turn it will either lock or unlock your doors.

__________________
95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K