Plastic, quartz clock, indoor temperature and humidity for a healthy living climate, outdoor temperature via waterproof cable probe, ideal also for refrigerator, freezer or aquarium, maximum and minimum values with manual or automatic reset, measuring range temperature cable probe -30...+60°C (-22... +140°F), cable length approx. 1.3 m, measuring range temperature outside -30...+60°C (-22... +140°F), measuring range temperature inside 0...+50°C (+32... +122°F), measuring range humidity 20...90%, batteries 2 x 1.5 V AAA not included in delivery