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This is a Mercedes-Benz keyless go entry control module for various models including W212 E, GLA, GLE, and SL. The part number A2129005422 is interchangeable with OE/OEM numbers A2129005422 and A212 9005422. Made in Germany, the control module features a fast microprocessor and is known for its easy installation. Constructed from plastic, this module is essential for providing keyless entry and start functionality in compatible vehicles.