The GDF-100 fits in the somewhat larger (size wise) range of models Casio released. It shares the same strap as the GA-100/110/120 and GD-100 series. Black resin, red accents with positive display (GDF-100-1A). Module: 3255 Time Keeping: Digital LCD Type: LCD Battery: CR2025 Battery Life: 5 years Color: Black Timekeeping: Digital Display: Positive LCD Type: LCD Band: Resin Bezel: Resin Glass: Mineral Glass Battery: CR2025 Battery Life: 5 years Weight: 69.2 g Size (HxWxT):55 x 51.5 x 17.2 mm