This key fob shell case is a replacement for 4-button remotes used in Buick, Cadillac, Chevrolet, and GMC vehicles with FCC ID OUC6000066. It is designed to hold your original circuit board, battery, and key blade. No programming or cutting is needed—just transfer your internal components into the new shell. The durable plastic case restores the look and function of your original key. A simple and cost-effective solution for worn or broken key fob housings.