ITEM NAME:XH-W1219 Dual LED Display DC 12V Thermostat Temperature Controller Module Sensor 1.Dual LED digital display 2.Waterproof NTC sensor 3.Safe and reliable intelligent control Description: 1.Model:XH-W1219 2.Control Range:-50~110 celsius 3.Control Precision:0.1 celsius 4.Measuring Input:NTC10K waterproof sensor L=0.5m 5.High Temperature Alarm:-49~110 celsius 6.Input Voltage:DC 12V 7.Output Type:relay output 10A (max) 8.Return Difference Setting:0.1~30 celsius 9.Delay Starting:0-10min 10.Temperature Calibration:-10~10 celsius 11.Size:60*43*16mm How to use: P0.Temperature Control Mode:when first use this product;if it is used to heating,please set H,if used to cooling,please set C P1.Return Difference Setting:long press SET key entering into internal setting,choose P1 seting;then press SET key to achieve return difference value setting P2:Temperature Calibration:this function is for temperature calibration.If detection temperature and actual temperature is different,then usrs can apply this function to calibrate P3:Delay Start:this function is for compressor cooling P4:Set High Temperature Alarm Value:when actual temperature is higher than this value,screen will flash and sound an alarm Restore Factory Settings: While power is on, press and hold the + - button for 3 seconds Note:Size for manual measurement, there may be a 0 to 2mm error, belongs to the normal phenomenon. 1pc Digital Temperature Controller 1pc Waterproof NTC sensor.P4:Set High Temperature Alarm Value:when actual temperature is higher than this value,screen will flash and sound an alarm. High Temperature Alarm:-49~110 celsius. Dual LED digital display. Waterproof NTC sensor.