From the manufacturer

Key Features

10 Year Battery

Built in 10 year battery that will provide a decade of use without the worry of changing batteries.

World Time

World time shows the time in 48 cities (31 time zones) around the world.

5 Daily Alarms + Hourly Time Signal

5 alarms that can be configured as a daily or a one time alarm and then is disabled automatically.

You can also turn on an hourly time signal which acts like a cuckoo clock that beeps twice at the top off every hour on the hour.

100 Meter Water Resistant

Suitable for everyday use and swimming and snorkeling but not suitable for high board diving or sub-aqua diving.