This weather monitor offers you accurate indoor/outdoor temperatures without running wires outside. The dual display is easy to read and shows the indoor temperature on the left and the outdoor on the right. It can read in the range of 32 degree F to 122 degree F. The remote sensor has a transmission range of up to 100 feet and a temperature range of -40 to 158 degrees. We find it ideal to have in the greenhouse finding it performs best when the sensor is placed in a location protected from direct sunlight and rain. Requires four “AAA” batteries (not included).