Casio’s Triple Sensor Version 3, advanced original technology that makes it possible to pack sensors that are 95% smaller than those of previous models into a compact PRO TREK. Despite their smaller size, the sensors in these models deliver higher reading accuracy and improved energy efficiency. These Triple Sensor models deliver altitude, barometric pressure, and direction readings that are more accurate than previous models, and a Barometric Pressure Tendency Alarm alerts the wearer to sudden changes in air pressure. Design features include a CORDURA* nylon fabric band for the ultimate in good fit and durability, and a case designed for outdoor gear performance. Large side buttons and one-press access to digital compass, barometric pressure and altitude, and temperature readings keep important information at your fingertips. Other features include Tough Solar, 100-meter water resistance, sunrise/sunset data and more. Everything about these models is designed and engineered to make them essential pieces of outdoor gear. *CORDURA is a registered trademark of INVISTA. CORDURA fabrics are woven from fibers characterized by extraordinary strength and durability. They are frequently used in outdoor gear and luggage, items that require particularly high levels of durability.