More Safety: Thermostat plug adopts high-conductivity copper plate, anti-patin; the shell is made of PC flame retardant material, high temperature flame retardant. The socket has a safety protection door to avoid electric shock caused by inserting fingers or small objects, prevent children from plugging in by mistake High Performance: With with a 1.8m NTC temperature sensor, plug in thermostat can displayed in Celsius or Fahrenheit. Temperature range: -40°C~120°C/-40°F~248°F, temperature control accuracy: ±1%, voltage: 230VAC 50Hz. Start temperature > stop temperature, cooling operation starts; start temperature < stop temperature, heating operation starts Multi Function: Thermostat controller has 5 temperature control modes: F01 cycle timer mode; F02 countdown on mode; F03 countdown off m.