Features: Press the RST key to open the humidity controller, on the working condition, press this button for 3 seconds, then the humidity controller can be turned off. Dehumidification mode: when the measured humidity is higher than or equal to the set value of + hysteresis, the relay rises to start the output; When the measured humidity is below the set value, the relay switches off and closes the output. Humidification mode: when the measured humidity is higher than or equal to the set value, relay off, turn off the output; When measured humidity below the set value-hysteresis, the relay rises to start the output. Specification: Power supply: AC 220V Working current: lt; 2W Sensor Type: HM40 Relay Point Current: AC 5A/220V Humidity Meter Range: 1% - 99% Humidity Control Range: 1% - 99% Humidity Meter Error: 3% Control, You Can Mention Them: 1% Operating Temperature: 0 - 50° Storage Temperature: -10 - 60° Data Storage: Yes Dimensions: 8.5x7.5x 3cm/3.35x2.95x1.18inch Color: Black Quantity: 1 Set Note:1. Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 Set Digital Humidity Controller