Triple sensor version 3 is the advanced casio original technology that makes it possible to pack sensors 95% smaller than those of previous models into a totally new type of compact pro trek. Despite their smaller size, the new sensors in this model provide improved reading accuracy & energy efficiency. This new triple sensor version 3 model delivers altitude, barometric pressure, & direction readings that are more accurate than previous models. A barometric pressure tendency alarm alerts the wearer to sudden changes in pressure readings, which can indicate upcoming weather events. This model is water resistant up to 200 meters & features full auto led display illumination, which makes it a great choice for wet environments & nighttime operations. A stainless steel rotary bezel can be positioned to help you keep track of your current & intended bearings.