Features: case/bezel material: resin resin strap resin crystal digital display illuminator led backlight afterglow chronograph function 1/100-second stopwatch daily alarm hourly time signal automatic calendar (29 days for february) 12/24-hour format regular timekeeping accuracy: ± 30 seconds per month day display buckle clasp 50m water resistance approximate size of case: 43.8 x 40.7 x 10.9mm