BA 110 1A (LADY) Size of case: 46.3 × 43.4 × 15.8 mm

GA 110GB 1A (MAN) Size of case : 55 X 51.2 X 16.9 mm

200-meter water resistance for an expanded sphere of activity
Introducing new PRO TREK high-performance outdoor watch for various environments including mountain and ocean. This watch not only offers the compass bearing and altitude features necessary for mountain climbing, but also strong water-resistance for river climbing and river rafting where the user may encounter strong water pressure, as well as convenient tide information for sea kayaking and fishing.
With a large display delivering outstanding readability, the PRG-250 has a dual-layer LCD construction. The sensor and other data are shown on the upper and lower LCDs, allowing the user to easily see the desired information.
In addition to being displayed numerically and in a trend graph, atmospheric pressure is shown using simply designed arrow icons which depict characteristic barometric pressure patterns. This function was developed under the supervision of a meteorologist. Consequently, an upward arrow is displayed when the atmospheric pressure suddenly rises, forecasting better weather ahead.
A downward arrow appears when the pressure suddenly falls, indicating weather deterioration.
There are also arrow icons to show when rising pressure changes to falling pressure, or vice versa, making it easy to ascertain weather changes.
• Tough Solar
• Triple Sensor: Compass, Barometer/Thermometer, Altimeter
• Low temperature resistant (-10ºC/14°F)

TRIPLE SENSOR
Introducing Triple Sensor Version 3, advanced CASIO original technology that makes it possible to pack sensor that are 95% smaller than those of previous models into a totally new type of compact PRO TREK. Despite their smaller size, the new 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

From G-SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness, comes G-STEEL, a watch series with a new "layer guard structure".
Different materials are used for the bezel to create a two-layer structure that adds a new dimension of shock resistant. For models that use stainless steel in the upper part, shock absorbing resin is employed in the lower part. If resin is used in the upper part, fine resin is used in the lower part to cushion against impact from the upper part. This also has made it possible create a wide range of different designs.
The GST-S100 model features a tough, quality design molded of resin.
A hand shift feature temporarily moves hands out of the way with the press of a button for easy reading of digital display contents, while double LED face illumination keeps information easy to read at all times.

• Layer guard structure
• Tough Solar
• Hand shift feature
• Double LED light illuminates the face and digital display for outstanding readability.