1 inbuilt wireless unit,can be used isolated in the whole queue management system 2 LCD display typeHQH05Display LCD displayKeypad11 number keys, 10 function keysInterfaceRS232, PS/2, TTL connectionPower supply12V DCConnectorRS485SecuritySoftware controlled DES/3DES & DUKPT key managementDimensions (L*W´*H)133mm×84mm×25mmKeypad Button MaterialRubberKey switch life>2×10,000,000 times calling ...