Wireless temperature sensor with frost protection function when temperatures fall below 6°C. The ambient temperature can be displayed as a value on a System 9000 control unit or in the app (paid version). The app also enables notifications when a definable temperature value is exceeded or not reached, as well as the display of the temperature trend. Measuring range -20°C to +60°C. Accuracy +/- 0.5°C. Occupies an address in the System 9000. Radio frequency: 868MHz. Power supply: 1x 3V lithium battery CR2032 (included). Operating temperature: -20°C to +60°C. Dimensions: 26 x 55 x 16mm.