Alerton’s VisualLogic Display (VLD) is a communicating sensor-controller combination with built-in temperature and humidity sensors that targets common applications such as roof top units, fan-coil units and heat pumps. It provides a cost-effective solution to meet in-room hotel requirements—an easy-to-use interface, easy-to-see digital display, and Celsius/Fahrenheit change over—where you already have Alerton systems in public or common areas.