Specifications: Temperature range :-30-110 Dimensions: 48.5 * 40mm Temperature control mode: ON / OFF Resolution:When temperature is 0.1, the resolution is -9.9~99.9, other temperature segment is 1 Control accuracy: 0.1 Hysteresis accuracy: 0.1 Refresh rate: 0.5S High temperature protection: 0-110 Supply voltage: DC 12V Static current: 35MA, attract current 65MA Output voltage: DC 12V Output power: 20A relay Measurement input: NTC (10K 0.5%) Waterproof Sensor Environmental requirements: -10 ~ 60 ,Humidity 20% -85% How to use: Connect the power supply and the load, you can supply to the controller, Is displayed as a measured temperature, Pre the SET button, the display flashes the temperature, Pre - to set the desired temperature, After setting pre SET to confirm return, The controller automatically performs the relay by setting off! Lights, LED status descriptions: Indicator: Off The relay is switched off, Always indicate the relay is closed. LED: Shows LL is the sensor open, showing ?HH is out of range, the thermostat will be forced to close the relay, the display --- as high temperature protection. Package Included: 1 x -30-110C Digital thermostat Temperature Control Switch 12V + waterproof NTC sensor W1209 Input Voltage: DC 12V Red LED Display Temperature Measurement Range: -50 Celsius~-110 Celsius Package Included: 1 x W1209 Digital Thermostat 1 x NTC Sensor Probe