The altimeter displays the current altitude in feet or meters, the difference between current and reference altitude, and graphic altitude history for the past 12 hours. Retains memory of maximum / minimum height reached and of the cumulative vertical ascent / decent. User-programmeable alarm. The barometer displays current barometric pressure in mb/hPa or in. Hg and graphical history for the past 12 hours. A storm alarm alerts user when a storm condition is approaching. oC or oF selectable. Clock features a user-selectable 12- or 24- hour format, month, date, alarm and a stopwatch on an easy to read LCD display includes wall mount and lanyard. Altimeter Specification : Range :-1,640 to + 22,965 (-500 m to + 7,000 m).