Wireless thermostat, battery operated, for wall mounting, sends to receiver Instat 868-a... Suitable for controlling central heating, warm water floor heating, warm air heating, night storage heating, etc. Very simple operation via analogue temperature setting. Range restriction in the setting knob to reduce heating costs. Control method, fuzzy (similar to PID) with pulse width modulation output, can be used for heating. With an indicator lamp for learning mode and battery change