Ambient Weather WS-40-3 Tri Zone Wireless Thermometer with Indoor and Outdoor Temperature Includes three display consoles that simultaneously reads the data from a single remote sensor so you can view data from three different locations! Wireless indoor and outdoor temperature, made simple. Looking for a device that does not require complicated programming? Simply insert batteries in the base and remote units, and install the thermometer outside or anywhere where temperature is critical. The outdoor temperature is transmitted to the display console inside. The display is simple and easy to read. The remote includes mounting hole for hanging outside or on a wall. Includes one year factory warranty from Ambient Weather.