Case diameter: 53.5mm (2.1") Metallic black resin case and top ring Stainless steel case back Reverse LCD display (black background with light digits) with time, seconds, day and date Functions include: chronograph, lap time, alarm, dual time, military time and backlight Matte black resin strap with buckle closure Inner band circumference range: 6.25" to 8.1" ASIN#: B06XPDP85T Model number#: 40/8284BLK