It is an easy-to-use, safe and reliable dual relay output temperature controller/Thermostat. It can be used as over temperature protection and automatic temperature control system for various electric appliances such as equipment for home-brew, pet breeding, incubation, seedling heat mats, terrestrial heat control, constant temperature cycle of heating pump, culture fermentation, accelerating germination, electric radiator, electric oven, etc. Feature: 1. Dual relay output sockets: Be able to connect with refrigeration and heating equipment at the same time. 2. Digital Display: Display the current temperature and the set highest and lowest temperature. 3. Temperature Unit: Supports Centigrade or Fahrenheit. 4. High and low temperature alarms are available. 5. Smart life or Tuya Smart App remote control and monitoring. 6. Can make setting with the button on device, and still keep work without WIFI. Constant temperature control Fish tank: Example: The most suitable temperature environment for ornamental fish is about 19? to 29?. Set the highest temperature is 29?, the lowest temperature is 19?. It will auto-start the heating output socket to increase the temperature when the current temperature is lower than 19?. If the temperature is higher then 29?, it will auto stop the heating, then switch to auto start cooling output socket to reduce the temperature. Constant temperature control greenhouse: Example: The most suitable temperature environment for greenhouse is about 25? to 35?. Set the highest temperature is 35?, the lowest temperature is 25?. It will auto-start the heating output socket to increase the temperature when the current temperature is lower than 25?. If the temperature is higher than 35?, it will auto stop the heating, then switch to auto start cooling output socket to reduce the temperature. Specifications: Power Voltage: AC 100-250V(US Plug),AC 230-250V(EU Plug) Rated Current: 10A Max Temperature measurement range: -30~105 C / -22~221? WIFI Frequency: 2.4GHz, not support 5G APP Control: Smart Life or Tuya Smart APP (Android 5.0/IOS 8.0 or above) Temperature Accuracy: 1%, the temperature can be calibrated. APP Control: Smart Life or Tuya Smart APP (Android 5.0/IOS 8.0 or above) Constant temperature control breeding incubation. Constant temperature control wine cellar Set upper and lower limit value of temperature alarm