The KELOX digital room thermostats are available for 230 V operating voltages. Easy individual room control is already possible with the directly connected actuators. In conjunction with the KM691 KELOX connection unit, a perfectly coordinated overall system is realisable for surface temperature control. All the features of the KM690D, plus: • Large, clearly laid out LC display with back-lighting - enables the display to be read in the dark. • For heating and cooling systems. • Smart Start/Smart Stop function. • Comfort programmes of heating and cooling mode. • Suitable for NC and NO mode.