GPS Signal Reception (auto or manaul) Multi-Band 6 Atomic Timekeeping Tough Solar Triple G Resist Tough Movement 200M Water Resistant GPS Signal Reception (auto or manual) for time or time & position Airplane Mode Multi-Band Atomic Timekeeping (US, UK, Germany, Japan, China) Receives time calibration radio signals which keep the displayed time accurate Auto receive function (up to 6 times per day/up to 5 times per day for China) Signal: US WWVB, UK MSF, Germany DCF77, Japan JJY40/JJY60, China BPC Frequency: US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz, BPC Size of case : 58.8x54.7x16.9mm Total weight : 198g Specifications Tough Solar Power Full Auto-Calendar (pre-programmed until the year 2099) Shock Resistant Day/Date Display Triple G Resist 12/24 Hour Formats Accuracy: x15 seconds per month (with no signal calibration) Tough Movement Storage Battery: Solar Auto hand home position correction Rechargeable Battery Smart Access Electronic Power Saving Function Crown w/Quick-lock Low Battery Alert 200M Water Resistant Approx. Battery Life: 7 months on full charge (without further exposure to light) LED Super Illuminator Light with Afterglow Core Guard Structure w/Alpha Gelx World Time 40 times zones (27 cities + UTC), daylight saving on/off Daily Alarm 1/1 second chronograph Sapphire Crystal w/Anti-Glare coating Measuring capacity: 23'59.59" Forged Stainless Steel Measuring modes: Elapsed time Caseback Countdown Timer Layered Panel Composite Band (Solid Stainless Steel & Fine Resin) Measuring unit: 1 second One-touch, 3-fold Buckle Countdown range: 24 hours Module: 5455 Countdown start time setting range: 1 to 24 hours (1-minute increments and 1-hour increments)