At A Glance Celebrate the 50th anniversary of Casio watches with the limited edition all-new Casiotron, a re-creation of the first-ever Casio wristwatch. With its debut in 1974, the Casiotron was the world''s first digital watch with an automatic calendar that automatically adjusted for longer and shorter months. The all-new TRN50 pays homage to the groundbreaking original while integrating today''s cutting-edge technology. With a meticulous reproduction of the original design, both in look and size, the external diameter is essentially the same, at 39.1mm, and the profile measures 0.3mm slimmer. You''ll find touches of the original throughout this limited edition, echoing that first design in the textured case and band, its dark blue dial, the Casiotron logo, and numerous other details. The case back features the same symbol as the original, slightly updated to commemorate the 50th anniversary of Casio watches. Each limited-edition timepiece is accompanied by an engraved serial number (0001/4000 - 4000/4000), just to highlight how rare these special watches are. Features Shock Resistant Radio Controlled - Multi Band 6 Bluetooth Connected Tough Solar Powered 50M Water Resistant Included with Purchase Casio G-Shock TRN50-2A G-Shock Box Instruction Module 1 Year Casio International Warranty Card Specifications Watch Features World Time World time 5 World time 39 time zones (39 cities +coordinated universal time), auto summer time (DST) switching, home city/world time city swapping Stopwatch 1/100-second stopwatch Measuring capacity: 00''00''''00~59''59''''99 (for the first 60 minutes) 1:00''00~23:59''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 Timer 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) Alarm 5 daily alarms Hourly time signal Light LED backlight (Super illuminator) Full auto LED light, selectable illumination duration (2 seconds or 4 seconds), afterglow Calendar Full auto-calendar (to year 2099) Mute Feature Button operation tone on/off Energy Saving Feature Power Saving (display goes blank to save power when the watch is left in the dark) Battery display/alert - Battery Level indicator Run Time 11 months on rechargeable battery (operation period with normal use without exposure to light after charge) 22 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy Accuracy: ±15 seconds per month (with no mobile link function) Time Adjustment Details Time Calibration Signals Station name: DCF77 (Mainflingen, Germany) Frequency: 77.5 kHz Station name: MSF (Anthorn, England) Frequency: 60.0 kHz Station name: WWVB (Fort Collins, United States) Frequency: 60.0 kHz Station name: JJY (Fukushima, Fukuoka/Saga, Japan) Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga) Station name: BPC (Shangqiu City, Henan Province, China) Frequency: 68.5 kHz Time calibration signal reception Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful) *5 times a day for the Chinese calibration signal The latest signal reception results Smartphone Link - App Connectivity Features Smartphone Link feature - Mobile link (Wireless linking using Bluetooth) Apps - Casio Watches App Connectivity Feature Auto time adjustment Easy watch setting Approximately 300 world time cities Time & place Reminder Phone finder Other Features 12/24-hour format Date/month display swapping Day display (days of the week selectable in six languages) Regular timekeeping: Hour, minute, second, pm, month, date, day Basic Information Case / bezel material: Stainless steel Band - Stainless Steel Band, Solid Band, One-touch 3-fold Clasp Construction - Shock Resistant Power Supply and Battery Life - Tough Solar (Solar powered) Water Resistant - 50m Case size (L× W× H) - 42.7 × 39.1 × 12.3 mm Weight - 111g