This Casio G-Shock GA-2100RW-1AER Classic oriented men's watch has a round case made of bio-based resin. Carbon core protection structure, shockproof. The bracelet is made of black bio-based resin. Multi-coloured dial. Mineral crystal glass, quartz movement (three years) and analog digital display. Water resistance: 20 ATM. Diameter: 48.5mm Weight: 51 g. Functions: World Time 31 time zones (48 cities + UTC) and daylight saving time activation/deactivation. 1/100 second stopwatch measuring capacity: 00'00"00~59'59"99 (during the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) Measuring unit: 1/100 second (during the first 60 minutes) 1 second (after 60 minutes). Measurement mode: Elapsed time, time fraction and time of first and second position. Countdown timer measuring unit: 1 second countdown interval: 24 hours setting range of countdown start time: between 1 second and 24 hours (in increments of 1 second, 1 minute and 1 hour). Five daily alarms. Time display Double LED lighting LED lighting for the dial (super illuminator, selectable lighting duration (1.5 or 3 seconds) and luminosity) LED lighting for digital display (super illuminator, selectable lighting duration (1.5 or 3 seconds) and white luminosity. Fully automatic calendar (up to 2099). Activate or deactivate the key sound. Accuracy: ±15 seconds per month. Other options: 12 hour and 24 hour format. Pointer change function (hands move to make the contents of the digital display clearly visible). Standard Time Display: Analog: 2 hands (Hour and minute [hands move every 20 seconds]), 1 dial (day). Digital: hour, minute, second, p.m., month and date. Three year warranty. Have fun with your Casio G-Shock Classic watch.