The new PRW6611Y-1 features Triple sensor technology (altimeter, barometer, and Compass), Multiband 6 Atomic timekeeping and is equipped with Tough Solar charging. This watch is one of the most desirable timepieces in the Pro-Trek line. The PRW6600Y-1A9 uses Casio's advanced SMART ACCESS system, which provides you with quick, intuitive access to all of the watch's key functions using an electronic crown.