1,Switch the modes between cool and heat control temperature by setting the temperature setting value and the difference value, Temperature calibration. 2,Refrigerating control output delay protection alarm when temperature exceeds temperature limit or when sensor error. 3,Using black jacket line, suitable for use in seawater and other acid and water in a narrow environment, the tolerance temperature of 70 ℃ 4,Button sound, key trigger, with the buzzer sound, both the experience of touch and have the feeling of hearing, so the operation is more easier. 5,The series of products on the button is equipped with a professional custom silicone pad, between the pieces and pvc in the formation of a buffer to extend the life of pvc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.