Innovic Multifunctional 4 in 1 Voltagemeter Thermometer and Hygrometer with Clock Inspect and display real time automobile storage battery voltage Alarm voice as voltage icon shows excessive or too low 2000-2099 Year Calendar (Year, Month, Date, Hour and Minuite) Temperature measure range : Indoor : -10~60C (14~140F) Outdoor : -50~70C (-58~158F)