wireless calling system 1 .can be used in the whole queue management system 2 .LCD display 3. inbuilt wireless module 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, ...