La Crosse Technology Comfort Meter with In/Out Temperature & Humidity

2 Window icons suggest opening or closing windows for optimal indoor humidity control5 Level humidity scale from dry to wet: Dry: below 34 %RH Comfort/Dry: 35-40 %RH Comfort/Ideal: 41-55 %RH Comfort/Wet: 56-64 %RH Wet: above 65 %RHWireless IN/OUT temperature (F/C) & humidity (%RH) with MIN/MAX recordsWall hanging or free standingBattery lasts up to 12 monthsTemperature Range: Indoor: 14.2 F to 139.8 F (-9.9 C to 59.9 C) Outdoor: -39.8 F to 139.8 F (-39.9 C to 59.9 C)Receiver Power: 2 AAA alkaline batteries (not included)Sensor Power: 2 AAA alkaline batteries (not included)