Analog thermometer requires no batteries for operation. Durable frame to use indoors or outdoors. Ideal mounting location is out of direct weather elements and sunlight. Recommend on a North-facing wall. Hang thermometer from a long nail, or screw (not included) with the built in key hole on the back. | La Crosse Technology | | 13.5 Inch Analog Dial Thermometer with key hider compartment | White | Best Buy