"Casio contributes part of the sales of the Whale series to the Eco-Research Network project, in hopes that it will help to protect and improve the global environment that is home to dolphins, whales, humans and other life forms. Whale watches are shock resistant tough, but pretty. They come in great, soft colors and have all the signature G-Shock shock and water-resistant features, in addition to an EL backlight with afterglow, 20-page data bank and World Time in 40 cities. They have a 5-day counter and have a stopwatch and an alarm, as well as an auto calendar, so you can be one together chick. Shock Resistant 200M Water Resistant EL Backlight with Afterglow 20 Page Databank Memory capacity: Up to 20 sets of data, each set including;Name (8 characters) and telephone number (12 digits) World Time 27 time zones (40 cities), city code display, daylight saving on/off Day Counter: Automatically counts down the days from the current date to a target date Memory capacity: 5 records (8 characters each) Daily Alarm 1/100 second stopwatch Measuring capacity: 23:59'59.99"" Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: +/- 15 seconds per month Battery CR1616 Approx. battery life: 2 years Module 2516 Case Size: 45.9 x 42.6 x 14.0mm (Approximately 1 5/8"" Case Width) Total Weight: 43g"