Power supply: 100V-240V AC Output: DC voltage output for SSR (Please note: SSR output is used for temperature control, it only be activated when measure temperature value lower than set temperature value , they are from timing . ) Temperature range: -20 to 600 Celsius Temperature unit: Celsius degree / Fahrenheit degree(user can program it inside) Mounting hole cutout size: 68 x 68mm Time Unit:Second or minute (user can program it inside) Time range:0-999s or 0-999min Low temperature function: When measure temperature lower than 50'C for a few minutes, thermostat jude that the sensor was not contact with heater , it display "HEt" to remind user . User should check the sensor and restart it . User can close this function by programming. Package Details: 1 x thermostat 1 x solid-state relay 1 x K-type thermocouple 1 x solid-state relay heat sink Color: As Shown Material: plastic Package Contents: 1 * Temperature controller set Only 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.