Ambient Weather WS-41 Wireless Thermometer with Indoor Temperature and Probe Wireless indoor and outdoor temperature, made simple 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 The remote sensor includes a water proof probe for measuring any wet temperature medium, including water, soil, refrigerators, and freezers