Relay output, easy to use. No wiring required—simply plug the device into this thermostat outlet and set the parameters for programmed operation. Power supply: 230 V AC; Output: up to 16A/230V. Product includes a 3-meter sensor probe for added convenience. Temperature control function with 1% accuracy. Temperature range: -40°C to 120°C. Set 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 outlet also supports temperature calibration. Timer function with cycle timing and countdown modes. Select cycle timer mode to operate devices in recurring cycles, or choose other countdown modes to turn devices on or off. Timer range: 0 to 99 hours 59 minutes. Note: Temperature control and timer functions cannot be used simultaneously. Additional features include 5 operating modes (temperature control mode, F01 cycle timer mode, F02 countdown ON mode, F03 countdown OFF mode, F04 ON/OFF countdown mode), large LCD display, temperature calibration, reset function, and power-off memory to retain all settings. Wide application range: commonly used in greenhouses, reptile enclosures, incubators, terrariums, freezers, refrigerators, heating systems, home brewing setups, vivariums, fermentation systems, heating mats, and other temperature-controlled environments. Can also be used as a timer for cycle timing and countdown operations.