G-Shock GDB500-7 Watch. A compact G-Shock in a boldly straight-forward design that moves style into the future. Resin case, bezel material and band. Shock resistant. 200-meter water resistance. Bluetooth: connects to a smartphone and automatically adjusts the time. Approximate battery life: +/- 2 years on CR2016. Dual time (home time swapping). 1/100-second stopwatch. Countdown timer. 5 daily alarms. Hourly time signal. LED backlight (LED: white). Full auto-calendar to year 2099. Mute feature: button operation tone on/off. Energy saving feature: power saving on/off. Low battery alert. Accuracy: +/- 15 seconds per month (with no mobile link function). Imported.