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Title: Metra LC‑GMRC‑01 GM Class 2 Data Bus Interface  
Category: Electronics  
Brand: Metra Electronics  
Description: A 12 V DC 3 A accessory output interface that retains all factory warning chimes for non‑amplified GM vehicles.  
Details: Built‑in speaker and Micro‑B USB connector keep warning chimes active when the OEM radio is removed.

Price is $