Casio G Shock Men's Watch GA 2100GB 1A Analog Digital 2100 Series Shock Resistant Carbon Core Guard Structure COUPLE G SHOCK+BABY G battery operating time: 5 months DW 6900WD 1 battery operating time: 5 months on rechargeable battery (operation period with normal use without exposure to light after charge) 19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) BGA 320 Series 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 1 minute increments and 1 hour increments)