Relay output, easy to use. No wiring required—simply plug the device into this thermostat temperature controller socket and set the parameters; it will operate as programmed. Power supply: 230 V AC; Output: 16A/230V max. The product comes with a 3-meter-long sensor probe for added convenience. Temperature control function with 1% accuracy. Temperature control range: -40°C to 120°C. Set the start and stop temperatures to control heating or cooling devices as programmed. (Start temperature higher than stop temperature for cooling; start temperature lower than stop temperature for heating). This thermostat socket also supports temperature calibration. Timer function. This temperature controller socket features cycle timing and countdown timing functions. You can select the cycle timer mode to control the device to operate in cycles, or choose other countdown modes to turn the device on or off. Timing range: 0–99 hours 59 minutes. Please note that the temperature control function and timer function cannot be used simultaneously. Additional features include 5 selectable modes (temperature control mode, F01 cycle timer mode, F02 countdown ON mode, F03 countdown OFF mode, F04 countdown ON and OFF mode), large LCD display, temperature calibration, reset function, and data storage—retains all settings after power-off. Wide range of applications. This temperature control socket is widely used in greenhouses, reptile enclosures, incubators, terrariums, freezers, refrigerators, heating appliances, home brewing systems, vivariums, fermentation setups, heating mats, and other temperature-controlled systems. It can also be used as a timer for cycle timing and countdown functions.