The New Prw6600y-1a9 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.