Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works great. No base station required.

I wanted something portable so I could check the temperature and humidity throughout my house. This does the trick. Also my cooling system has a humidity dial but it doesn't tell you what humidity it is adding to your house. I believe you want around 40-45%. If humidity is too low, you can suffer from dry noses, skin, and throats, as well as cracked fingertips, and you're more likely to catch a cold. Dryness can also damage wood and drywall, cause your wood floors to shrink. Humidity that is too high will stain ceilings and walls, and can cause paint and wallpaper to peel. It also can cause mold. Use rechargeable batteries this think eats batteries.I had to recharge after