This is a basic room thermostat for your house heater, like boiler.  With a dial button, easy to operate for older people or chidrens.   Item No.: HT-02 NP Non Programmable Dial Button Easy on/off mode Specification Temp. Range: 5~35℃ Temperature measurement accuracy: ±0.5°C    Power supply:  2x AAA 1.5V Alkaline Battery