Black Digital Wave Ceptor Watch with Resin Band featuring Countdown Timer, World Time, 1/100 Second Stopwatch and EL backlight with Afterglow.Face Diameter: 1.75" Technical Specs:Multi-Band Atomic Timekeeping (US, UK).Receives time calibration radio signals which keep the displayed time accurate.Auto receive function (6 times per day).Manual receive function.Signal: US WWVB, UK MSF Frequency: US, UK 60kHz 50M Water Resistant. EL Backlight with Afterglow. World Time.29 times zones (48 cities), city code display, daylight saving auto/on/off. Daily Alarm. Countdown Timer.Measuring unit: 1 second.Countdown range: 1 second to 60 minutes. 1/100 second digital stopwatch.Measuring capacity: 59&';59.99"Measuring modes: Elapsed time, lap time, split time, 1st-2nd place times. Hourly Time Signal. Auto Calendar (pre-programmed until the year 2099). 12/24 Hour Formats. Accuracy: +/-20 seconds per month (with no signal calibration). Battery CR1620. Approx. battery life: 2 years. Module 3054