Product: Wristwatch Casio CASIO Collection F-91WM-2AJH 1 piece This is a color variation model of the best-selling F-91W. Weight: 21g, displays date, day of the week, alarm, and stopwatch. Drive system: Quartz Battery life: Approximately 7 years * The battery built into the watch is a monitor battery for checking operation. Water resistant for daily life Stopwatch (1/100 second, 60-minute counter, with split) Alarm, hourly time signal LED light (green) Auto calendar 12/24 hour display switching Shipping: Scheduled to be sent by standard mail.