O81RF wireless radiator thermostat is equipped with:– Block function in case of window opening– Antifreeze anti-calcification function– In case of setting change the new set values are automatically sent to all the other thermostats in the zone– Kid function to disable the buttons– Anti-removal accessory available as accessoryBack lit LCD display for easy temperature reading, set point and mode function readingBattery life: approx. 2 years (with 2 comfort cycles / day)Protection degree: IP20Connection: standard M30x1,5. Accessories included: adaptors for Danfoss valves RA/RAV/RAVLLCD dimensions 40 x 28 mmThermostat dimensions and weight: 90 x 64 x 70 mm. – 170 g. Electric featuresPower supply: 3V (2 batteries 1,5V AA).