Temperature range : -10～60℃(14～140℉) Temperature accuracy : ±1℃/1.8℉ Temperature resolution : 0.1℃/℉ Humidity range : 20%RH～95%RH Humidity resolution : 1%RH External sensor Indoor temperature and indoor relative humidity reading Time and alarm function,and give the correct time hour by hour Memory the maximum,minimum temperature and humidity ℃ and ℉ Temperature switch function Display: time,temperature and humidity display in large LCD Power: 1X1.5V AAA battery