Alarm: This feature is designed to alert the watch wearer to a specific, pre-designated time.
Altimeter: This feature measures the altitude of an object above a fixed level, such as sea level.
Calendar: This feature, which can be found in analog and digital watches, displays the day and date in a given month on the watch's dial face.
Chronograph: A chronograph is a specific type of watch that combines stopwatch functionality with a typical display watch.
Luminous: A watch with luminous features can be read at night or other low-light situations.
Water Resistant: A watch that is water resistant has been tested to resist damage due to water at specific depths. The water resistance level is often marked on the dial or caseback.
Compass: A compass is a navigational instrument that measures directions in a frame of reference, such as the cardinal direction points of N,S,E and W.
Depth Measurement: This instrument, mostly found in dive watches, measures depth beneath a fixed level.
GPS: GPS instrumentation is essentially a space-based satellite navigation system that provides location and time information.
Heart Rate Monitor: Mostly found in sport and active watches, this instrument measures the wearer's heart rate.
Moon Phase Calendar: This calendar function, which is an ornamental display often found in dress watches, chronicles the phases of the moon throughout a given month.
Screw-Down Crown: This crown type, which is commonly found in dive watches, screws into the side of the case via a special tube to lock out debris and water.
Shock Resistant: This feature is a common mark stamped on the back of wrist watches to indicate how well a watch copes with mechanical shocks. A watch described as "shock resistant" has survived a series of shock tests.
Stopwatch: This functionality is designed to measure the amount of time elapsed from a particular time when the device is activated to when the device is deactivated.
Tachymeter (Tachometer): This functionality is designed to measure revolutions per minute.
Timer: A timer is simply a specialized mechanism designed to measure time intervals.