Product Instructions for use: Connect the supply and equipment, the measuring temperature is displayed.Press the SET button, press + or - to set the desired temperature, long press + or - to quickly increase or decrease.Press SET to confirm the setting and return, controller automatically performs the relay ON or OFF.The thermostat output is 10A relay, meet a variety of high- loads. LED Indicator: LED off indicates the relay off; Lighting, indicates the relay is closed.Material: Metal+ABSColor as shownDigital LED tubes: LL indicates sensor open, indicates overrange, the relay will be forcibly disconnected; --- indicates high temperature alarm.Long press the SET button to enter the main settings.Press + or - to switching between P0-P6.Then long press SET or 10 seconds without keystrokes to confirm the setting and return.Specifications:Model: W1209 with caseDimensions: 48.5 x 40 mmTemperature control mode: ON or OFFTemperature range: -50 - 110 degree centigradeResolution: when temperature is 0.1 degree, the resolution is -9.9 - 99.9, other temperature segment is 1 degree.Control accuracy: 0.1 degreeHysteresis accuracy: 0.1 degreeRefresh rate: 0.5 sHigh temperature protection 0 - 110 degree centigradeSupply voltage: DC 12VStatic current: less than 35MA, attract current less than 65MAOutput voltage: DC 12VOutput : 20A relayMeasurement input: NTC, 10K 0.5 percent waterproof sensorRequirements: -10 - 60 degree centigrade, humidity: 20 - 85 percentPackage Contents:4 x W1209 12V DC digital temperature controller boards with caseOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.