What is the switch for on side on key fob on 1995 E280?

The switch on the side of the key fob for a 1995 E280 typically functions as a remote trunk release or an alarm toggle. It allows the driver to quickly access the trunk or activate/deactivate the vehicle's alarm system. Depending on the specific model and features, the switch might also be used for other functions like locking or unlocking doors. Always refer to the owner's manual for precise details regarding your specific key fob's features.