This product using high-performance digital temprature and humidity sensors,high brightness LED Display 1.Power: 220VAC, 1W (using efficient switching power supply)2.display:Temperature and humidity-channel 1.5-inch bright LED digital3.Temperature display Range: -9-55 degree in celsius,precision:+/-1 degree in celsius;4.Humidity display Range:20-95%RH ,precision:+/-5% RH5.storage conditions : ...