Wireless. Indoor/outdoor temperature, pressure trends, time, moon phases, date, humidity, barometric pressure, wind direction and speed, rainfall amounts and a graphical forecast. Three channels allow for the use of three separate sensors (compatible sensor 36-1797). Comes with rain gauge, anemometer and temperature sensors which wirelessly transfer information to the weather station. 8 x AA/LR6 batteries (not included). Receiver size: 255x102x35 mm.