Features:Reset: Power off, press and hold the "S" button to power on again, release the button after the LED light is on.Timing setting: double-click the "S" button LED1 flashes, click the up/down for arrow pattern button to adjust the value; click "S" to switch LED2.The blue digital tube displays the real-time temperature, and the red digital tube displays the power-off temperature.100cm NTC waterproof probe; easy to set up and start; 1-way normally open relay control output; there is a setting lock to prevent accidental for touch,Adjustable temperature range -50C~120C; minimum measurement: 0.1C; error: 1%; no over-temperature alarm; no buzzer; Package Includes:1x Digital Temperature Control Relay Specifications:Material: ABSColor: White for Shell with Blue Base/Black for Shell with Blue BaseWorking Voltage: DC12VLoad Power: DC12V 20A 240WModel : T2401-O(active Output,connect the Load and then Power ,avoid Short Circuits)Only Accept Dc12v LoadSupport Cycle Switch, Do Not Support Alternate 1 SwitchSize:47.6x28.6x33.2mm/1.87x1.12x1.31inchHole Size : 45x26.1mm/1.77x1.03inchTiming Range : 0-999(seconds,minutes,hours)Minimum Unit:1 Second Technical Parameter:dc 12V 20A Max 240W MaxOperating Humidity : 35%~85%Adjustable Temperature Range: -50C~120CTiming Error:4.5% Integrated Crystal Oscillator Precise Timing is Not Recommended note:Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.