Tough Solar Power. Multi-Band 6 Atomic Timekeeping. Tough Movement 1/100th Second Chronograph - Centrifugal Force Resistance up to 15G. 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 68.5kHz. Tough Solar Power.