This is a model from the metal-covered series of the G-SHOCK, a tough watch that has continued to evolve since its release in 1983, pursuing unyielding strength. The entire watch is finished in black-out. The metal bezel is treated with black IP, creating a chic design that can be widely used as a fashion item. The base model is the GM-2100 with an octagonal bezel. The all-black color scheme makes it a cool design that can be widely used. Case size (H x W x D) 49.3 × 44.4 × 11.8 mm Weight 72 g Case/Bezel Material Resin / Stainless Steel Band Resin Band Structure Shock-resistant structure (Shock Resist) Water resistance 20 ATM water resistance Power supply and battery life Battery life: approx. 3 years World time: 48 cities worldwide (31 time zones, with summer time setting function) + UTC (Coordinated Universal Time) time display Stopwatch (1/100 second (less than 1 hour) / 1 second (1 hour or more), 24-hour counter, with split) Timer (set unit: 1 second, maximum set: 24 hours, measured in 1-second increments) Alarm 5 time alarms, hourly time signal Light Double LED light: LED light for the dial (Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds)) LED backlight for LCD (Super Illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds)) Light color LED: White Calendar Full auto-calendar Operation sound ON/OFF switching function Operation sound ON/OFF switching function Accuracy Average monthly difference: ±15 seconds Other functions 12/24 hour system display switching Hand evacuation function (When the hands overlap the LCD display and are difficult to see, the hands can be temporarily evacuated from above the LCD display) Included items: Box Included items: Box, warranty Operation: Good Scratches/cracks: None