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 arrows 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. Minimum measurement: 0.1C; error: 1%; no over-temperature alarm, no buzzer, automatic operation when power on, and save settings when power off. Package Includes: 1x Digital Temperature Control Relay Specifications: Material: ABS Color: White for Shell with Blue Base/black for Shell with Blue Base Model : T2401-N(no Output,the Load Circuit Should Be Connected to the Power Supply) Can Accept Dc12v or Ac220v Load Support Cycle Switch, Do Not Support Alternate 1 Switch Size:47.6x28.6x33.2mm/1.87x1.12x1.31inch Hole Size : 45x26.1mm/1.77x1.03inch Timing Range : 0-999(seconds,minutes,hours) Minimum Unit:1 Second Technical Parameter:DC 12V 20A 240W ,AC220V 1500W(max) Operating Humidity : 35%~85% Operating Temperature:-10-60 Timing 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.