This product is a 4x4 Transfer Case Control Module (TCCM) designed for Chevrolet Silverado trucks from 2003 to 2006. It is easy to install and made of durable plastic material. The module features a clip-on mounting style and a male connector type with 3 pins. It is a genuine OEM part from General Motors with manufacturer part numbers 12580061, 12584314, 12590219, and 15763041. The TCCM may require programming, you can contact your local GM dealership for more information.