Casio G-shock Atomic Solar Black Dial Analog/digital Mens Watch Awg100bc-1a Multi-Band Atomic Timekeeping (US, UK, Germany, Japan),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, Germany DCF77, Japan JJY40/JJY60,Frequency: US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz Tough Solar Power, Shock Resistant, 200M Water Resistant,LED Light with Afterglow World Time, 29 times zones (48 cities), city code display, daylight saving on/off, 3 Multi-function Alarms (1 with snooze), Daily Alarm Countdown Timer, 1/100 second stopwatch, Hourly Time Signal, Auto Calendar (pre-programmed until the year 2099),12/24 Hour Formats Storage Battery: CTL1616, Battery Power Indicator,Power Saving Function, Approx. battery life: 7 months on full charge (without further exposure to light)