This product is a safe and reliable "domestic genuine product." Unlike inexpensive imported goods, you can receive service from Casio in Japan, so please purchase with confidence. ■ Size: Approximately 51.4 x 47.1 x 16.1mm ■ Weight: 50g ■ 10-bar water resistance ■ Functions ■ Vibration function (timer notification, time alarm / hourly signal notification via vibration; operation sound is muted when the vibration function is ON) Dual time Stopwatch (1/100 second, 24-hour counter, with split, 5-second countdown auto-start) Timer (set unit: 1 second, maximum set: 24 hours, measured in 1/10 second increments) Time alarm Hourly signal Full auto-calendar 12/24-hour display switching LED backlight (Super Illuminator, with afterglow function) Accuracy: ±30 seconds per month Battery life: Approximately 10 years Although the design is similar to G-SHOCK, it is not a G-Shock. Thank you.