Londa Indoor Thermometer Hygrometer Monitor with Temperature Gauge and Home Comfort Monitor,Black Display indoor humidity comfort levels and daily highs and lows temperature and humidity records Digital thermometer hygrometer displays high and low temperature & humidity records Measures indoor humidity and temperature (For C),Indoor temperature measurement range: 0C ~ + 50C (32F ~ 122F) Comfort zone icon readout for indicating humidity comfort levels, display temperature / humidity trend arrow; Stylish design, comes with hang hole & bracket to hang on the wall or stand on the tabletop Power By : 2 x 1.5V AAA Battery( not included)