... to evaluate work personnel service quality 2. 3-press keys:satisfy ,general ,dissatisfy Evaluation of controller placed in ... service quality typeGHC02Light LCD lightPanel DescriptionComprehensive evaluation, four function keys, employee cardInterfaceRS232, PS/2, TTL connectionPower supply12V DCConnectorRS485Dimensions ... in general, satisfied3, the automatic voice prompts; 3 keys Evaluation Controller