Electro-luminescent backlight.
Altimeter:Range: -500 / +9000 m, rsp. -1600 .. +29500 feet . Resolution : 1 m, rsp. 3 feet
Measures the current vertical ascent or descent speed. Performs one measuring per second for the first three minutes and then one measuring every ten seconds.
Altitude alarm.
Altitude difference measuring
Log feature stores the following information: Date and time, Average vertical ascent speed and total ascent ,Average vertical descent speed and total descent and Number of labs (a new lap starts after a decent of at least 50 m, rsp. 150 feet while ascending or vise a versa).
Barometer: Range: 300 - 1100 mBar, rsp. 8.90 - 32.40 inHg.
Resolution: 1 mBar, rsp. 0.05 inHg .
Adjustable pressure on sea level.
Automatic hourly measuring for trend analysis .
Automatic 4-day logging with hourly measurings for the last 6 hours, after that one measuring every 6 hours.
Pressure difference measuring.
Temperature compensation.
Temperature:: Temperature range: -20 - +50°C, rsp. -5 - +120°F.
Digital Compass: Heading in degrees and in clear text.
Continuously updated.
Shows deviation from pre-set direction.
Calendar pre-programmed up to the year 2089.
Dual Time.
Stopwatch.
3 daily alarms.
Titanium case. Rubber & Titanium band.
Dimensions:
Length: 49 mm. (1,89 inches).
Wide: 45 mm (1,73 inches).
Diameter: 45 mm (1,73 inches).
Height: 14 mm (0.54 inches).
Weight: 79 g (2.84 ounces).
Warranty: 2 years.
You can see Suunto Observer Instruction manual (PDF)