Soundtraxx DCC Mobile Decoder MC2H104AT is a HO-scale 4-function decoder designed to replace existing manufacturer light boards in Atlas HO diesel models, select InterMountain Railway models, and locomotives with a similar physical design. This compact decoder measures 74 x 17 x 3mm and provides reliable performance for model railroaders looking to upgrade their locomotives with advanced DC and DCC capabilities. The Soundtraxx DCC Mobile Decoder MC2H104AT operates in both conventional DC mode and NMRA-compatible DCC systems, making it a versatile choice for a wide range of HO-scale locomotive installations. It features four function outputs for controlling lighting and other accessories, with each output supporting up to 100mA of function current. The decoder supports a maximum DCC track voltage of 22 volts and offers a motor stall current rating of 1A for dependable locomotive operation. Designed for easy installation, this decoder fits replacement applications where a factory light board-style decoder is required. Its slim 3mm profile allows it to fit into locomotives with limited internal space while maintaining strong electrical performance and functionality. Whether upgrading an existing locomotive or installing a new control system, the Soundtraxx DCC Mobile Decoder MC2H104AT provides a practical solution for model railroad enthusiasts seeking improved control, lighting options, and compatibility with popular HO-scale diesel models.