"The PAG40B-2V improves on the basic PATHFINDER concept by providing altitude measurements up to 10,000 meters and other improved functions, plus a larger display panel with a dual-level display screen indicates direction readings by a pointer that seems to float above other display data. The result is more information in a format that is easier to read. In addition, direction, and altitude/barometric pressure readings can be triggered by pressing a single button, providing the information you need the instant you need it. Tech Specs: Electro-luminescent backlight- auto light switch afterglow Low Temperature Resistant (-10°C/14°F) Digital compass Altimeter/Barometer Thermometer 1/100 Second Stopwatch Five Independent Daily Alarms Hourly Time Signals Auto-Calendar (to year 2039) 12/24 hour formats Regular timekeeping Accuracy: ±15 seconds per month Case Size approx 2"" wide by 3/4"" thick. Blue Nylon strap is comfortable and durable. Approx. battery life: 18 months on SR927Wx4"