Signal Range: Up to 2m (may differ depending on surrounding conditions), Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Time & place and Phone finder using the CASIO CONNECTED APP Daily Alarms: Each will sound every day at the time you set, Hourly time signal: The watch beeps every hour on the hour

The button tones on the mode button can be switched off for discreet operation. Pre-set alarm or timer functions remain active. Measuring Capacity: 24 hours, Measuring Modes: Elapsed time, split time, Measuring Unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Powered by any light source, saving time and money as no battery change required- known as TOUGH SOLARDual Illuminator: Separate illumination of the analogue and digital components ensures optimum readability in low light conditions., LED light, Selectable illumination duration (1.5 seconds or 3 seconds), With afterglow CASIO WATCH+ World Time lets you select from among approximately 300 cities as the World Time City, Displays the current time in major cities and specific areas around the world The GMS2100 is a bit more than just a sized-down version of the GM2100. Visually, this is not true (since they are very similar in look), but these men’s and women’s watch collections also have different movements. The GM2100 has the more high-function movement since it includes an additional subdial hand and corresponding scale for the day of the week. Both the GM2100 and the GMS2100 have easy-to-read analog hour and minute hands on the main dial, but also small LCD screens (negative-colored LCD screen on the men’s models) that provide additional data. As well as the time, the GM2100 watch has a full calendar, stopwatch, countdown timer, five alarms, and a 48-city world timer feature. The dial also has a bright LED-based illumination system (two LEDs on the dial, actually, according to Casio) — for reading it in the dark.