The HandHeld Display (HHD) provides operators with rapid access to relevant information and controls for GE Multilin protection relays. It features a 3.5-inch color LCD screen, a rugged enclosure for on-site use, and industrial magnets for temporary mounting. The HHD interface includes function keys for navigation and control, and direct-acting START A, START B, and STOP buttons. It displays system status, actual values, setpoints, diagnostics, and allows for programming of MM300/MM200 devices. The device utilizes an intuitive graphical interface organized hierarchically, allowing users to easily navigate through various pages like Home, Values, Status, Setpoints, and Diagnostics.