Function of humidification and dehumidification / Hysteresis functionHumidity correction / Delay protectionFunction of Upper and Lower limit / with wide humidity measuring range and controlling rangeComes with a humidity controller sensor probe with cable and a temperature sensor probe with cableHumidity Measuring Range: 1% ~ 99% RH / Humidity controlling range: 1% ~ 99% RHSpecification:Humidity Measuring Error: 3%Resolution: 1% RH;Sensor Type: HM-40 Suppler: AC 220VCurrent: MAX 200MAData retention: YES consumption: Relay contact current: AC 5A/220VTemperature compensation: YESData Retention: YESWorking temperature: 0C - 50 CStorage temperature: -10C - 60 CSize(L x W x H): Approx. 83 x 75 x 33mmProbe size(D x L): Approx. 4 x 20mmKey notes:: Press key to switch satrting up and off, on the condition of off, it can start up when press key , on the condition of starting up, it can off when press and hold the key for three seconds.SET: Press key SET to enter settings of humidity control, and press key or to adjust. Press and hold key or for three seconds to enter the fast adjust mode. Press key SET again to exit setting mode.Package Includes:1 x Humidity controller WH80401 x Humidity controller sensor probe with cable1 x Temperature sensor probe with cableNOTE: For customers from Europe, Australia, New Zealand, most Asian Countries, South America and Africa, Use 220 V. The temperature sensor being used to calculate humidity more precise depending on the temperature inside of the house and it should be installed in the vicinity of the humidity probe.Note:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.