B640WB-1A Striking the perfect balance between style and functionality, the B640WB-1A features a sleek, glossy black finish with a range of functions including a calendar, multi-alarm, and stopwatch. The light-emitting diode (LED) ensures readability in any light setting and is 50m water resistant. Band Type: Stainless Steel Band Case and Bezel material: Resin Size: 38.9 × 35 × 9.4 mm Colour: Black Glass: Resin Glass Water resistance: 50 M Timer: • Countdown timer • Measuring unit: 1 second • Countdown range: 24 hours • Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) • Other: Auto-repeat Light: • LED backlight • Afterglow Calendar: Full auto-calendar (to year 2039) Stopwatch: • 1/100-second stopwatch • Measuring capacity: 00'00''00~59'59''99 (for the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) • Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) • Measuring modes: Elapsed time, split time, 1st-2nd place times Alarm/hourly time signal: Hourly Time Signal Multi-function alarm