Brand new and high quality. Temperature range: -9-99 deg Accuracy: 1 deg Control accuracy: 1 deg Setting Range: -9-99 deg Refresh rate: 0.5S. Input Power: DC9V-15V. Output: relay 220V 10A / 12V 10A. Environmental requirements: -10-60 deg Humidity: 20% -85%. Temperature sensor: NTC(3950-10k 1%) wire length 520mm Size: 7.8cm x 5.1cm x 3cm . Ideal for use as a flow controller on a wetback / radiator system where the hot water valve to your radiators wont come on till cylinder at say 75 deg then stays on untill eventually the water temp drops to say 55 thus enabling the cylinder to stay hot enough for domestic use. Operating Instruct. 1, High temperature start. Set the starting temperature value> stop temperature value. When the detected temperature = start temperature, the relay is closed, refrigeration equipment work. When the detected temperature = stop temperature, the relay off, refrigeration equipment stops working. For example: Set the starting temperature to 30 , stop temperature is 25 . When the detected temperature = 30 , the relay is closed, the start Indicator (red) lights. When the detected temperature value = 25 , the relay off, stop Indicator (green) light. 2, cold start: start temperature set value. When the detected temperature = start temperature relay is closed, the heating device operates. When the detected temperature = stop temperature, the relay off, the heating device is stopped. For example: Set the starting temperature is 25 , stop temperature is 30 . When the detected temperature value = 25 , the relay is closed, the start Indicator (red) lights. When the detected temperature = 30 , the relay off, stop Indicator (green) light. 3, Set to start when the temperature value = stop temperature value, the relay off.