Body/Ring Material: Resin Resin bracelet Resin Glass / Spherical Glass LED luminous background Automatic light circuit, Light persistence Phone memory Memory capacity: up to 25 groups of data, with 8-character name and 15-digit telephone number Others: Remaining memory screen, automatic sorting, accepts characters from 13 languages ​​(English, Portuguese, Spanish, French, Dutch, Danish, German, Italian, Swedish, Polish, Romanian, Turkish, Russian) Double time Others: daylight saving time 8-digit calculator Calculation modes: Arithmetic operations and currency conversion 1/100 second stopwatch Measuring capacity: 23:59'59.99' Measurement modes: Elapsed time, time division, time at 1st and 2nd point Multi-functional alarms 5 independent multi-functional alarms (4 hourly and 1 with alarm clock/hourly alarm function) Alarm Type: Daily Alarm, Date Alarm, 1 Month Alarm, Monthly Alarm signaling every hour Automatic calendar (until the year 2099) 12/24 hour formats Regular time: Hour, minutes, Monday, am/pm (post meridiem), year, month, date, day Accuracy: ±30 seconds per month Duration approx. battery life: 10 years with CR2025 Box size / Total weight Box size: 50.4×37.4×12mm Total weight: 34g