These Controllers receive sensor signals and control heaters or other devices to maintain a preset temperature . They can also be used for humidity, pressure, and flowrate control. Specification: Supply power: AC 110-230V Relay control output: 10A (1xtemperature 1x humidity) Humidity control range: 0-100% Temperature control range: -20°C +60°C Accuracy: +-0.3°C and +-3% Dimensions : 75x85x35mm Model Number: SHT-2000 Theory: Temperature Controller Package includes: 1 x SHT 2000 Temperature Humidity Controller 110V 230V