This thermometer has one LCD display that shows both the inside and outside temperatures simultaneously. It will record maximum and minimum temperatures. The outside temperature sensor is waterproof and is on 3 meters of cable. Tilting bail for standing up and screw holes (screws supplied) for wall mounting. Displays both Celsius and Fahrenheit, switch selectable. Range: -39.9C to + 49.9C. Size: 110mm(h) x 100mm(w) x 22mm(d). Operates on AAA battery. (supplied)