This attractive watch automatically adjusts to the correct time based on radio signals broadcast by the NIST’s atomic clock located in Boulder, CO. Serves as a reference for exact time in the lab or in the field. Displays standard or military time, date, weekday, time zone and confirmation of the atomic clock signal. Self adjusts for daylight savings time. Light (1.6 oz) yet sturdy this watch is comfortable to wear and water resistant. Features electro-luminescent backlight, stopwatch, alarm and manual time setting functions. The battery (included) lasts about 1 year with normal use and must be replaced by a watch technician to uphold the warranty. Face Diameter : 1 3/4″ Band Width : 1″ tapering to 3/4″ Features : Self Adjusts for Daylight Savings Time Stopwatch Function in Standard and Split Time Manual Time Setting Option 3 ATM Water Resistant