"Multi-Band Atomic Timekeeping (US, UK, Germany, Japan)Receives time calibration radio signals which keep the displayed time accurate Auto receive function (up to 6 times per day) Manual receive function Signal: US WWVB, UK MSF, Germany DCF77, Japan JJY40/JJY60 Frequency: US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz Tough Solar Power Stores energy from any type of light (sunlight to fluorescent) to keep the watch running. Even if the battery charge runs out, it is fully rechargeable. Shock Resistant: A basic structure with several layers of protection supports the module comprising the watch core, preventing transmission of intense shocks 200M Water Resistant Neo-brite luminous hands and markers World Time: 29 times zones (27 cities), city code display, daylight saving on/off Daily Alarm 1/20 second chronograph Measuring capacity: 59'59.95"" Measuring modes: Elapsed time Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Accuracy: +/-20 seconds per month (with no signal calibration) Storage Battery: CTL1025 Power Saving Function Approximate battery life: 5 months on full charge (without further exposure to light) Module 4777 Case Size: 49.8 x 46.8 x 15.2mm Total Weight: 92 grams"