Casio G-Shock 40th anniversary Limited Edition DWE-5640rx-7DR. Multi-material band: An homage to materials used in iconic G-SHOCK models of the past. The band design featuring appealing, contrasting combinations of resin and metal materials symbolically expresses the evolution of materials used in G-SHOCK watches. The band attached at 12 o’clock is made of resin and urethane. A composite section with see-through fine-resin links is paired with a urethane section that connects to the case with a slide lever. The band attached at 6 o’clock is made of stainless steel. The links feature alternating colors, contrasting silver with gold IP, and the clasp features an engraving to commemorate the G-SHOCK 40th anniversary. Case size (L× W× H). 48.9 × 43.8 × 13.7 mm. Case and bezel material. Stainless Steel / Resin Composite Band. Carbon Core Guard structure. Power supply and battery life. Battery life: 3 years on CR2016. Gold ion plated band. 150 to 205 mm. 1/100-second stopwatch Measuring capacity: 00’00”0059’59”99 (for the first 60 minutes) 1:00’0023:59’59 (after 60 minutes) Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring modes: Elapsed time, split time, 1st-2nd place times. Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Other: Auto-repeat. Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm. LED backlight (Super Illuminator) Afterglow. Full auto-calendar (to year 2099). Accuracy: ±15 seconds per month. Items are well packaged. Feel free to ask questions.