The G-Shock GM2100BM-1A is a men's watch from the 2100 series, featuring a black colorway.

• Resin and stainless steel construction
• Bio-based resin band
• Mineral glass
• Ion-plated bezel
• Shock resistant
• 200-meter water resistance
• 3 years battery life
• 31 time zones
• 1/100-second stopwatch
• Countdown timer
• 5 daily alarms
• Hourly time signal
• Double LED light
• Full auto-calendar (to year 2099)
• Button operation tone on/off
• Accuracy: ±15 seconds per month
• 12/24-hour format
• Dimensions: 49.3 x 44.4 x 11.8 mm