At a glance

The multi-layered design of the G SHOCK GA-400 creates a solid three-dimensional appearance complimented by a revolutionary rotary switch. Located at 3 o'clock, the rotary switch enables intuitive operation of classic G SHOCK features including the World Time, Countdown Timer and 5 Daily Alarms.


Battery Life

3 years

LED Light

Auto light switch, selectable illumination duration, afterglow

12/24 Hour Format

Times can be displayed in either a 12-Hour or 24 Hour Format.

Countdown Timer

Countdown range: 24 hours

Size of case

55.0 × 51.9 × 18.3 mm

Total weight

70 g


+/- 15 seconds per month

Display Illumination

Auto light switch, selectable illumination duration, afterglow

Alarm Function

Daily Alarm: sounds each day at the time you set

Auto Calendar

Fully automatic calendar, with allowances made for leap years, pre-programmed to 2099

World Time

World time for 48 cities (31 time zones, daylight saving on/off, home city/world time city swapping) and coordinated universal time


1/100th Sec Stopwatch

Water Resistant

200 Metre/20 Bar


Related Links

Support Information