... , up to 128 buttons, POWER_ON/OFF button supported. For custom keymap, please contact us.Keyboard / MouseUSB expansionLEDsIndication ... board 4 fixing holes for user customized add-in cardSensors (optional)On-board Sensor header for user Sensor add-in module, ... Reset buttonLEDOn-board indication LEDsPower12V DC-Input5W max for spare board.MechanicalSizeStandard 3-inches industry computer,146mm(L ...