These watch guts from Casio can receive radio synchronization signals from six transmitters around the world every hour at the 55-minute mark-if the individual holes in the gear sprockets don't line up in precisely the exact position as measured by a 16Hz blinking LED and a phototransistor, the watch adjusts accordingly. The first Tough Movement watch, the G-Shock GS-1200, will be available in Japan for $388. [Tech ON via Oh Gizmo]