MC-118LD-H65 is an ultra-low-profile, high-density, side-locking board-to-board connector manufactured by JST (Japan Solderless Terminals). It belongs to JST's renowned "MC" series. Its core function is to provide reliable multi-signal electrical connections and mechanical fixation between two parallel printed circuit boards at an extremely low stacking height. It is specifically designed for modern portable electronic devices with severely constrained space.