What It Says On The Box:
LCD temperature and hygrometer (humidity) gauge. The unit will show temperatures at actual gauge (IN) or at remote probe (OUT). The display can be switched using the IN/OUT button. The C/F button will toggle between Centigrade and Fahrenheit. The MAX/MIN button will show the maximum or minimum temperature at either the gauge or remote probe. Humidity is measured using the remote humidity probe. Probe cable lengths are 900mm (36"). Each probe has a sucker for attaching to glass. The gauge has a fold out leg so it can stand on a flat surface. Uses AAA size battery, which is supplied. Size of gauge - 60 x 60 x 15mm (2.5" x 2.5" x 0.75").