LiftMaster LPEXP CAPXL Loop Detector Input Board is an internal loop detector input board used with the LiftMaster CAPXL access-control panel to add plug-in loop detector input capability It mounts inside the CAPXL and works with the LOOPDETLM plug-in loop detector so a vehicle arriving at a loop can automatically trigger a call to a guard, office, or configured destination depending on the system setup. This product page is written to help match the part by model family, part number, electrical requirements, and application rather than by appearance alone. For best results, compare the original label, wiring diagram, and parts breakdown before ordering, especially on older operators or access systems that may have been repaired or upgraded over time.